Unit 2 Chapter 1 (1st Secondary) Biology

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Which technology was essential for the development of the cell theory?
- Telescopes
- Scientific researches
- Freezing techniques
- Microscopes

About This Quiz

This quiz covers foundational concepts of cell biology for 1st-year secondary students, focusing on the history and principles of cell theory.

Unit 2 Chapter 1 (1st Secondary) Biology - Quiz

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2.

He advanced the cell theory with his conclusion that cells could only come from other cells. ……
- Antonie Van Leeuwenhoek
- Rudolf Virchow
- Theodor Schwann
- Robert Hook
Correct Answer

A. Rudolf Virchow

Explanation

Rudolf Virchow advanced the cell theory with his conclusion that cells could only come from other cells. This conclusion, known as the principle of biogenesis, contradicted the prevailing belief at the time that cells could spontaneously generate. Virchow's work was instrumental in solidifying the concept that all living organisms are composed of cells and that cells are the fundamental units of life.

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3.

Which is not true for the cellular theory?
- Cells are the basic functional units for all living organisms.
- All living organisms are made up of cells.
- Theodor Schwann is one of the scientists that the theory is credited to.
- Some cells arise spontaneously.
Correct Answer

A. Some cells arise spontaneously.

Explanation

The cellular theory states that all living organisms are made up of cells and that cells are the basic functional units for all living organisms. Theodor Schwann is one of the scientists credited with the development of this theory. However, the statement "Some cells arise spontaneously" is not true for the cellular theory. According to the theory, cells can only arise from pre-existing cells through cell division.

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4.

The beginning unit is always a cell. It starts then from cells …....
- To tissues, to organs, to systems, to organisms.
- To tissues, to systems, to organs, to organisms.
- To systems, to tissues, to organs, to organisms.
- To organs, to organisms, to tissues, to systems.
Correct Answer

A. To tissues, to organs, to systems, to organisms.

Explanation

The correct answer is "To tissues, to organs, to systems, to organisms." This answer follows a logical progression from smaller units (cells) to larger units (tissues, organs, systems, organisms). It is a hierarchical order that represents the organization of living organisms.

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5.

What did Leeuwenhoek do?
- Looked at cork cells.
- Stated that animals are made of cells.
- Stated that all plants are made of cells.
- Used simple microscope and saw microorganisms.
Correct Answer

A. Used simple microscope and saw microorganisms.

Explanation

Leeuwenhoek used a simple microscope and observed microorganisms. This is evident from the statement that he "used a simple microscope and saw microorganisms." This suggests that Leeuwenhoek made significant contributions to the field of microbiology by being one of the first to observe and document microscopic organisms.

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6.

Which of the following group of scientists contributed to the cell theory?
- Rudolf Virchow, Albert Einstein, Anton van Leeuwenhoek
- Matthias Schleiden, Theodor Schwann, Rudolf Virchow
- Robert Hooke, Charles Darwin, Anton van Leeuwenhoek
- George Carver, Matthias Schleiden, Charlie Sheen
Correct Answer

A. Matthias Schleiden, Theodor Schwann, Rudolf Virchow

Explanation

Matthias Schleiden, Theodor Schwann, and Rudolf Virchow are the scientists who contributed to the cell theory. Matthias Schleiden concluded that all plants are composed of cells, Theodor Schwann concluded that all animals are composed of cells, and Rudolf Virchow proposed that cells can only arise from pre-existing cells. Together, their contributions formed the foundation of the cell theory, which states that all living organisms are composed of cells and that cells are the basic units of life.

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7.

Which of the following scientists concluded that all PLANTS are made of cells?
- Matthias Schleiden
- Rudolf Virchow
- Robert Hooke
- Theodor Schwann
Correct Answer

A. Matthias Schleiden

Explanation

Matthias Schleiden concluded that all plants are made of cells.

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8.

What is one way in which all living things on Earth are alike?
- All living things have hair.
- All living things are made of cells and come from other cells.
- All cells of all living things have chloroplast.
- All living things can move.
Correct Answer

A. All living things are made of cells and come from other cells.

Explanation

All living things are made of cells and come from other cells. This is a fundamental characteristic of all living organisms. Cells are the basic building blocks of life and are responsible for carrying out all the necessary functions for survival. They contain genetic material, carry out metabolic processes, and are capable of reproducing. This is a universal trait shared by all living things on Earth.

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9.

He placed a slice of cork under his microscope and he called the structure observed as 'cell'. The person mentioned is …....
- Antony van Leeuwenhoek
- Matthias Schleiden
- Theodor Schwann
- Robert Hooke
Correct Answer

A. Robert Hooke

Explanation

Robert Hooke is the correct answer because he is credited with discovering and naming the cell. He placed a slice of cork under his microscope and observed small, box-like structures which he called "cells" because they reminded him of the cells of a monastery. This observation was a significant contribution to the field of biology and laid the foundation for the cell theory.

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10.

All the following statements are true regarding the "cell theory" except .....
- All living things or organisms are made of cells.
- All cells arise spontaneously.
- Cell is the basic structural and functional unit of life.
- All cells arise from preexisting cells.
Correct Answer

A. All cells arise spontaneously.

Explanation

The cell theory states that all living things or organisms are made of cells, that the cell is the basic structural and functional unit of life, and that all cells arise from preexisting cells. Therefore, the statement "All cells arise spontaneously" is not true according to the cell theory.

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11.

The smallest unit that can perform the basic activities of life is a(an) …....
- Cell
- Tissue
- Organ
- Organism
Correct Answer

A. Cell

Explanation

A cell is the smallest unit that can perform the basic activities of life. Cells are the building blocks of all living organisms and are capable of carrying out essential functions such as metabolism, reproduction, and responding to stimuli. They are the fundamental units of life and are responsible for maintaining the overall structure and function of an organism.

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12.

Among the disadvantages of using dyes for staining certain parts of the sample is that, dyes …..
- Kill the living sample.
- Prevent light from passing through.
- Affect the focus of the object.
- Affect the resolution of the microscope.
Correct Answer

A. Kill the living sample.

Explanation

Dyes used for staining can kill the living sample because they often contain toxic chemicals that can be harmful to living organisms. When the dye is applied to the sample, it can penetrate the cells and disrupt their normal functioning, leading to cell death. This can be a disadvantage when studying live samples or when trying to observe the sample's natural behavior or processes.

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13.

In the comparison between light microscope (L.M) and electron microscope (E.M), one of the following comparisons is wrong ……
- L.M depends on light / E.M depends upon a beam of high speed electrons.
- L.M has glass lenses / E.M have electromagnetic lenses.
- L.M has a maximum magnification power of 1500 times / E.M has a magnification power about one million times.
- The electron ray has a longer wave length than the light ray.
Correct Answer

A. The electron ray has a longer wave length than the light ray.

Explanation

This statement is incorrect because the electron ray in an electron microscope actually has a much shorter wavelength than the light ray in a light microscope. The shorter wavelength of the electron ray allows for much higher magnification and resolution in an electron microscope compared to a light microscope.

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14.

Cells differ from each other in the shape, structure and size because …....
- Each kind of cell has its own proteins.
- Each kind of cell has its own sugars and lipids.
- Each kind of cell has to perform different function.
- Each kind of cell has its own chromosomal number.
Correct Answer

A. Each kind of cell has to perform different function.

Explanation

Cells differ from each other in terms of shape, structure, and size because each kind of cell has to perform a different function. Different cells in the body have specialized roles and responsibilities, such as nerve cells transmitting signals, muscle cells contracting, and blood cells carrying oxygen. These specialized functions require cells to have specific structures and shapes that enable them to carry out their designated tasks efficiently. Therefore, the variation in shape, structure, and size among cells is a result of their unique functions.

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15.

A student examined some plant cells by light microscope, at the beginning he obtained the figure (A), and then he obtained the figure (B). What did he perform for obtaining the figure (B)?
- He added a certain stain to the specimen
- He changed the light level
- He added ethyl alcohol to the specimen
- He used a lens with a higher magnifying power
Correct Answer

A. He used a lens with a higher magnifying power

Explanation

The student obtained figure (B) by using a lens with a higher magnifying power. This means that he switched to a lens that had a greater ability to magnify the specimen, allowing him to see more detail and obtain a clearer image.

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16.

Which general type of microscope a scientist would be most appropriate to use inorder to view a virus with a diameter of 80 nm.
- Van Leeuwenhoek microscope
- Robert Hooke microscope
- Electron microscope
- Light microscope
Correct Answer

A. Electron microscope

Explanation

An electron microscope would be the most appropriate type of microscope to view a virus with a diameter of 80 nm. This is because electron microscopes use a beam of electrons instead of light to magnify the specimen, allowing for much higher resolution and the ability to visualize objects at the nanoscale. Light microscopes, on the other hand, have a limited resolution and would not be able to clearly visualize a virus of this size. Van Leeuwenhoek and Robert Hooke microscopes are both types of light microscopes and would not be suitable for viewing a virus at the nanoscale.

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17.

Which of the following is a magnifying power of a light microscope?
- 40,000x
- 4,000x
- 4x
- 400x
Correct Answer

A. 400x

Explanation

The magnifying power of a light microscope refers to how much larger an object appears when viewed through the microscope compared to the naked eye. The magnifying power is determined by the combination of the objective lens and the eyepiece lens. In this case, the correct answer is 400x, indicating that the object will appear 400 times larger when viewed through the microscope compared to the naked eye.

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18.

Which of the following is not a principle that cell theory is based on?
- Cells are the smallest structures found within an organism.
- All living organisms are made up of one or more cells.
- All cells are made from preexisting cells.
- The basic functional unit of all living organisms is the cell.
Correct Answer

A. Cells are the smallest structures found within an organism.

Explanation

The correct answer is "Cells are the smallest structures found within an organism." This statement is not a principle of cell theory because cell theory does not specify the size of cells. Cell theory states that all living organisms are made up of one or more cells, all cells are made from preexisting cells, and the basic functional unit of all living organisms is the cell. However, it does not make any claims about the size of cells.

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19.

It is known that as little as 51% of the original liver mass can regenerate back to its full size after either surgical removal or chemical injury. This agrees with the views of ------------ opinion.
- Robert Hook
- Matthias Schleiden
- Theodor Schwann
- Rudolf Virchow
Correct Answer

A. Rudolf Virchow

Explanation

Rudolf Virchow is the correct answer because he is known for his theory of cellular pathology, which states that all cells arise from pre-existing cells. This theory aligns with the idea that the liver can regenerate because the remaining liver cells are able to divide and multiply to restore the organ to its original size.

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20.

An amoeba (a single-celled organism) can reproduce by replicating its genetic material and splitting in half to produce two new cells. Which principle of cell theory does this process support?
- Cells cannot function in groups and must work individually.
- Cells are the smallest biological structure within an organism.
- All cells are made from preexisting cells.
- All living organisms are made up of more than one cell.
Correct Answer

A. All cells are made from preexisting cells.

Explanation

The process of an amoeba reproducing by replicating its genetic material and splitting in half supports the principle of cell theory that states that all cells are made from preexisting cells. This is because the amoeba is creating two new cells through cell division, rather than spontaneously generating new cells.

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21.

How did Antoine van Leeuwenhoek contribute to the development of cell theory?
- Van Leeuwenhoek stated that the new cells in an organism are produced by preexisting cells.
- Van Leeuwenhoek used a microscope to view a piece of cork that he determined was made up of small compartments he called “cells.”
- Van Leeuwenhoek used lenses to make simple microscopes that could view living organisms under greater than 200x magnification.
- Van Leeuwenhoek determined that all living organisms are composed of cells.
- Van Leeuwenhoek studied plant tissues and determined that plants are composed of cells.
Correct Answer

A. Van Leeuwenhoek used lenses to make simple microscopes that could view living organisms under greater than 200x magnification.

Explanation

Antoine van Leeuwenhoek contributed to the development of cell theory by using lenses to make simple microscopes that could view living organisms under greater than 200x magnification. This allowed him to observe and document the existence of microorganisms, which were previously unknown. His observations provided evidence that living organisms are composed of cells, supporting the concept of cell theory.

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22.

How did Robert Hooke contribute to the development of cell theory?
- Hooke studied plant tissues and determined that plants are composed of cells.
- Hooke stated that the new cells in an organism are produced by preexisting cells.
- Hooke used lenses to make simple microscopes that could view living organisms under greater than 200x magnification.
- Hooke determined that all living organisms are composed of cells.
- Hooke used a microscope to view a piece of cork that he determined was made up of small compartments he called “cells.”
Correct Answer

A. Hooke used a microscope to view a piece of cork that he determined was made up of small compartments he called “cells.”

Explanation

Robert Hooke contributed to the development of cell theory by using a microscope to view a piece of cork and determining that it was made up of small compartments he called "cells." This observation was significant because it provided evidence that living organisms are composed of cells, leading to the understanding that cells are the basic units of life. Hooke's discovery of cells was a crucial step in the development of cell theory and our understanding of the structure and function of living organisms.

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23.

One of the three major tenets of classical cell theory is that cells arise from other cells. What else is considered to be a principle of cell theory?
- Eukaryotic cells have evolved from prokaryotic cells.
- The organelle is the basic functional unit of all living organisms.
- The atom is the basic functional unit of all living organisms.
- All living organisms are made up of cells.
Correct Answer

A. All living organisms are made up of cells.

Explanation

The correct answer is that all living organisms are made up of cells. This is considered to be a principle of cell theory because it states that cells are the fundamental building blocks of life and that all living organisms, regardless of their complexity, are composed of cells. This principle is supported by extensive scientific evidence and observations, and it forms the foundation of our understanding of biology and the structure and function of living organisms.

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24.

The wavelength of an electron beam is shorter than that of visible light. What is the advantage of using a source of illumination with a short wavelength in an electron microscope?
- A shorter wavelength allows for a higher resolution.
- A shorter wavelength helps in seeing samples faster.
- A shorter wavelength decreases the preparation time of samples.
- A shorter wavelength removes artifacts from samples.
Correct Answer

A. A shorter wavelength allows for a higher resolution.

Explanation

Using a source of illumination with a short wavelength in an electron microscope allows for a higher resolution. This is because the resolution of an imaging system is inversely proportional to the wavelength of the illuminating radiation. So, by using a shorter wavelength, the electron microscope is able to produce images with greater detail and clarity, allowing for a higher resolution.

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25.

What is the difference between scanning electron microscopes and transmission electron microscopes?
- Scanning electron microscopes are used to examine viruses, while transmission electron microscopes are used to examine bacteria.
- Scanning electron microscopes are used to view the internal structures within a specimen, while transmission electron microscopes are used to view the external features of samples.
- Scanning electron microscopes are used to study the cell surface, while transmission electron microscopes are used to study the internal structure of the cell.
- None of the answers are correct.
Correct Answer

A. Scanning electron microscopes are used to study the cell surface, while transmission electron microscopes are used to study the internal structure of the cell.

Explanation

Scanning electron microscopes (SEMs) and transmission electron microscopes (TEMs) are both types of electron microscopes used for examining specimens. However, the main difference between them lies in the type of information they provide. SEMs are used to study the cell surface, allowing researchers to observe the external features of samples. On the other hand, TEMs are used to study the internal structure of the cell, providing detailed information about the internal components and organelles. Therefore, the correct answer states that SEMs are used for studying the cell surface, while TEMs are used for studying the internal structure of the cell.

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26.

To magnify minute objects, a light microscope uses a beam of light as a source of illumination, whereas an electron microscope uses a beam of accelerated electrons. In what other ways do they differ?
- Glass lenses are used in light microscopes, while high-tech glass lenses are used in electron microscopes.
- Glass lenses are used in light microscopes, while electromagnetic lenses are used in electron microscopes.
- High-tech electrostatic lenses are used in light microscopes, while electromagnetic lenses are used in electron microscopes.
- Electrostatic lenses are used in light microscopes, while electromagnetic lenses are used in electron microscopes.
Correct Answer

A. Glass lenses are used in light microscopes, while electromagnetic lenses are used in electron microscopes.

Explanation

Light microscopes use glass lenses to focus the beam of light and magnify the objects, while electron microscopes use electromagnetic lenses to focus the beam of accelerated electrons and magnify the objects. Glass lenses are not suitable for electron microscopes due to the high energy of the electrons, so electromagnetic lenses are used instead.

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27.

What is the advantage of a light microscope over an electron one?
- Has a much higher range of magnification.
- Has a much higher resolution.
- By which we can observe the uptake of colored pigments by the cells.
- It is much more expensive than the electron one.
Correct Answer

A. By which we can observe the uptake of colored pigments by the cells.

Explanation

The advantage of a light microscope over an electron one is that it allows us to observe the uptake of colored pigments by the cells. This means that we can study and analyze the process of how cells absorb and utilize pigments, which can provide valuable insights into various biological processes and functions. This advantage is not mentioned for the other options, making it the correct answer.

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28.

Which of the following was not a major event in the history of the development of cell theory?
- Hooke viewing the remains of cells in a slice of cork under a microscope
- Schleiden concluding that all plants are comprised of cells
- Van Leeuwenhoek viewing living cells from algae and protists under his microscope
- Schwann identifying that bacteria and viruses were single-celled organisms
- Virchow determining that all cells are produced by preexisting cells
Correct Answer

A. Schwann identifying that bacteria and viruses were single-celled organisms

Explanation

The major events in the history of the development of cell theory include Hooke's observation of cells in cork, Schleiden's conclusion about plant cells, Van Leeuwenhoek's observation of living cells, and Virchow's discovery about cell division. Schwann's identification of bacteria and viruses as single-celled organisms is not a major event in the development of cell theory because it is not directly related to the understanding of cells as the basic unit of life.

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29.

Bacteria, which are single-celled organisms, divide in half to make new bacteria. How is this statement related to cell theory?
- It is related because bacteria are unicellular.
- It is related because eukaryotic cells have evolved from prokaryotic cells.
- It is related because cells arise from other cells.
- This statement is not related to cell theory.
Correct Answer

A. It is related because cells arise from other cells.

Explanation

This statement is related to cell theory because it supports the concept that cells arise from other cells. According to cell theory, all living organisms are composed of cells, and cells can only arise from pre-existing cells through cell division. Bacteria, being single-celled organisms, divide in half to produce new bacteria, providing evidence for the idea that cells can only come from other cells.

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30.

How did Matthias Schleiden contribute to the development of cell theory?
- Schleiden studied plant tissues and determined that plants are composed of cells.
- Schleiden used lenses to make simple microscopes that could view living organisms under greater than 200x magnification.
- Schleiden used a microscope to view a piece of cork that he determined was made up of small compartments he called “cells.”
- Schleiden stated that the new cells in an organism are produced by preexisting cells.
- Schleiden determined that all living organisms are composed of cells.
Correct Answer

A. Schleiden studied plant tissues and determined that plants are composed of cells.

Explanation

Matthias Schleiden contributed to the development of cell theory by studying plant tissues and determining that plants are composed of cells. This observation was crucial in establishing the idea that cells are the basic building blocks of all living organisms. Through his research, Schleiden provided evidence for the cell theory and helped to advance our understanding of the fundamental unit of life.

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31.

Microbiology is the study of all living organisms that are too small to be visible to the naked eye. Why is Antoine van Leeuwenhoek considered the founding father of microbiology?
- Because he was the first scientist to discover penicillin
- Because he is often cited as the first to observe the microbial world
- Because he pioneered the use of a simple microscope to view viruses
- Because he developed the germ theory of disease
Correct Answer

A. Because he is often cited as the first to observe the microbial world

Explanation

Antoine van Leeuwenhoek is considered the founding father of microbiology because he is often cited as the first scientist to observe the microbial world. He was the first to use a microscope to observe and describe microorganisms, making significant contributions to the field of microbiology. While he made many important discoveries, including the observation of bacteria and other microorganisms, he did not discover penicillin or develop the germ theory of disease.

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32.

In blood smears, Leishman’s stain gives white blood cells different colors in a range of shades between pink, purple, and blue. Which microscope is used with this type of staining?
- The scanning probe microscope
- The scanning electron microscope
- The light microscope
- The transmission electron microscope
Correct Answer

A. The light microscope

Explanation

Leishman's stain is a type of stain used in blood smears to differentiate white blood cells. It gives them different colors in a range of shades between pink, purple, and blue. The light microscope is used with this type of staining to observe and analyze the stained blood cells. The light microscope is a commonly used microscope in biological research and allows for the visualization of cells and their structures using visible light.

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33.

Which is true for the cellular theory?
- Cells are similar in shape, structure and size.
- The muscular cell can contract and relax.
- The nerve cell is long to transfer electrical impulses along its axon.
- The cell is the basic unit of life.
Correct Answer

A. The cell is the basic unit of life.

Explanation

The cellular theory states that the cell is the basic unit of life. This means that all living organisms are composed of cells and that cells are the smallest structural and functional units of life. The other options mentioned in the question, such as cells being similar in shape, structure, and size, the ability of muscular cells to contract and relax, and the long structure of nerve cells to transfer electrical impulses, are all characteristics of specific types of cells, but they do not encompass the overall concept of the cellular theory.

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34.

Which of the following was done by T. Schwann?
- He said that not all plants are made of cells.
- He said that not all animals are made of cells.
- He stated that all living organisms body are composed of cells.
- He stated that the new cells are produced only by other living cells.
Correct Answer

A. He stated that all living organisms body are composed of cells.

Explanation

T. Schwann stated that all living organisms' bodies are composed of cells. This implies that every living organism, regardless of whether it is a plant or an animal, is made up of cells. This statement is significant because it supports the cell theory, which states that cells are the basic units of life and that all living things are composed of cells. Schwann's contribution to the cell theory helped to establish the fundamental understanding of the structure and function of living organisms.

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35.

Why are microscopes important when studying most cells?
- Most cells are opaque.
- Most cells found in multiple layers.
- Most body cells are not in a direct contact with the external environment
- Most cells are very small.
Correct Answer

A. Most cells are very small.

Explanation

Microscopes are important when studying most cells because most cells are very small. Microscopes allow scientists to magnify and visualize these tiny cells, enabling them to study their structure, function, and other characteristics in detail. Without microscopes, it would be difficult to observe and understand the intricate workings of cells, which are the building blocks of all living organisms.

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36.

In order to screen the composition of a large sized objects under light microscope, they have to be sliced into thin slices , …..
- So that the edge of the diaphragm can just be seen at the perimeter of the field of view.
- So that to allow the light to permit through.
- So that to be within the diameter of the field of view.
- So that to bring the specimen clearly into focus.
Correct Answer

A. So that to allow the light to permit through.

Explanation

The correct answer is "So that to allow the light to permit through." Slicing the large-sized object into thin slices allows light to pass through the specimen, which is necessary for observation under a light microscope.

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37.

If SEM refers to scanning electron microscope and TEM refers to transmission electron microscope. The figure below represents pollen grains and white blood cells under each of the SEM and the TEM. What are A1, A2, B1 and B2?
- A1 pollen grains under SEM / A2 pollen grain under TEM / B1 white blood cells under TEM / B2 white blood cell under SEM.
- A1 pollen grains under TEM / A2 pollen grain under SEM / B1 white blood cells under TEM / B2 white blood cell under SEM.
- A1 pollen grains under TEM / A2 pollen grain under SEM / B1 white blood cells under SEM / B2 white blood cell under TEM.
- A1 pollen grains under SEM / A2 pollen grain under TEM / B1 white blood cells under SEM / B2 white blood cell under TEM.
Correct Answer

A. A1 pollen grains under SEM / A2 pollen grain under TEM / B1 white blood cells under SEM / B2 white blood cell under TEM.

Explanation

The correct answer is A1 pollen grains under SEM / A2 pollen grain under TEM / B1 white blood cells under SEM / B2 white blood cell under TEM. This is because SEM refers to scanning electron microscope, which is used to observe the surface of specimens, such as pollen grains. TEM refers to transmission electron microscope, which is used to observe the internal structure of specimens, such as the internal structure of pollen grains. Therefore, A1 represents pollen grains observed under SEM, A2 represents pollen grains observed under TEM, B1 represents white blood cells observed under SEM, and B2 represents white blood cells observed under TEM.

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38.

What happens to the image of the light microscope if the ocular lens is 40X and the objective lens is 50X …….
- It will be magnified 90 times.
- It will be magnified 2000 times.
- It will be magnified 200 times.
- It will be unclear.
Correct Answer

A. It will be unclear.

Explanation

The total magnification of a light microscope is calculated by multiplying the magnification of the objective lens by the magnification of the ocular lens. In this case, the objective lens has a magnification of 50X and the ocular lens has a magnification of 40X. Therefore, the total magnification is 50X * 40X = 2000X. Since the total magnification is very high, it is likely that the image will be unclear due to limitations in the resolution and quality of the microscope.

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39.

On studying the surface of a white blood cell, which of the following should be used?
- Light microscope of magnifying power x 2000
- Light microscope of magnifying power x 2500
- Scanning electron microscope of magnifying power x 3500
- Transmission electron microscope of magnifying power x 8900
Correct Answer

A. Scanning electron microscope of magnifying power x 3500

Explanation

A scanning electron microscope (SEM) should be used to study the surface of a white blood cell because it provides a high-resolution image of the surface topography. The SEM uses a focused beam of electrons to scan the surface of the sample, and the interaction between the electrons and the sample produces signals that can be used to create a detailed image. The magnifying power of x 3500 indicates that the SEM can magnify the image 3500 times, allowing for a closer examination of the cell surface.

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40.

From the figure below, what is the name of the scientist who stated this principle in the cell theory?
- Virchow
- Van Leeuwenhoek
- Robert Hooke
- Schwann
Correct Answer

A. Schwann

Explanation

The correct answer is Schwann because he was the scientist who stated the principle in the cell theory. The cell theory, which states that all living organisms are composed of cells, was proposed by Matthias Jakob Schleiden and Theodor Schwann in the 1830s. Schwann specifically contributed to the theory by stating that cells are the basic unit of structure and function in all living organisms.

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41.

Which of the following is the correct sequence of events for the development of cell theory?
- Manufacturing and using simple microscopes → determining that all living organisms are comprised of cells → determining that plants are comprised of cells → understanding that new cells are produced by preexisting cells
- Manufacturing and using simple microscopes → determining that plants are comprised of cells → determining that all living organisms are comprised of cells → understanding that new cells are produced by preexisting cells
- Determining that plants are comprised of cells → determining that all living organisms are comprised of cells → manufacturing and using simple microscopes → understanding that new cells are produced by preexisting cells
- Manufacturing and using simple microscopes → understanding that new cells are produced by preexisting cells → determining that plants are comprised of cells → determining that all living organisms are comprised of cells
Correct Answer

A. Manufacturing and using simple microscopes → determining that plants are comprised of cells → determining that all living organisms are comprised of cells → understanding that new cells are produced by preexisting cells

Explanation

The correct sequence of events for the development of cell theory is as follows: first, manufacturing and using simple microscopes allowed scientists to observe cells. Then, they determined that plants are comprised of cells. Next, they determined that all living organisms are comprised of cells. Finally, they understood that new cells are produced by preexisting cells. This sequence represents the progression of discoveries and observations that led to the development of the cell theory.

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42.

Which of the following is used to increase the contrast between different parts of sclerenchyma tissue seen under a light microscope whose magnification power of the ocular lens is (X15) where a suitable light passes through it?
- Staining the specimen with a suitable dye
- Increasing the thickness of the specimen
- Using an objective lens of magnification power more than (X100)
- Increasing the magnification power of the microscope to (X3000)
Correct Answer

A. Staining the specimen with a suitable dye

Explanation

Staining the specimen with a suitable dye is used to increase the contrast between different parts of sclerenchyma tissue seen under a light microscope. This is because the dye selectively binds to different components of the tissue, making them more visible and distinct. The increased contrast allows for better observation and analysis of the tissue structure and composition.

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43.

Which general type of microscope a student would be most appropriate to use inorder to view a living human egg cell (ovum) with a diameter of 100 μm.
- Van Leeuwenhoek microscope
- Robert Hooke microscope
- Electron microscope
- Light microscope
Correct Answer

A. Light microscope

Explanation

A light microscope would be the most appropriate type of microscope to view a living human egg cell because it allows for the visualization of living cells without damaging them. Light microscopes use visible light to illuminate the specimen and magnify it, making it suitable for observing cells and their structures. In contrast, electron microscopes use a beam of electrons to create an image, which can be harmful to living cells. Van Leeuwenhoek and Robert Hooke microscopes are historical types of light microscopes, but they may not have the necessary magnification or resolution to view a human egg cell.

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44.

How did Rudolf Virchow contribute to the development of cell theory?
- Virchow used lenses to make simple microscopes that could view living organisms under greater than 200x magnification.
- Virchow stated that the new cells in an organism are produced by preexisting cells.
- Virchow studied plant tissues and determined that plants are composed of cells.
- Virchow used a microscope to view a piece of cork that he determined was made up of small compartments he called “cells.”
- Virchow determined that all living organisms are composed of cells.
Correct Answer

A. Virchow stated that the new cells in an organism are produced by preexisting cells.

Explanation

Rudolf Virchow contributed to the development of cell theory by stating that the new cells in an organism are produced by preexisting cells. This idea, known as biogenesis, challenged the prevailing belief of spontaneous generation and supported the concept that cells are the fundamental units of life. Virchow's statement provided evidence for the principle of cell division and laid the foundation for understanding cellular reproduction and growth.

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45.

Regarding cell theory, which of the following scientists recognized that the building units of different animal tissues are fundamentally the same?
- Schwann
- Hooke
- Schleiden
- Virchow
Correct Answer

A. Schwann

Explanation

Schwann recognized that the building units of different animal tissues are fundamentally the same. This refers to the concept of cell theory, which states that all living organisms are composed of cells and that cells are the basic units of structure and function in living organisms. Schwann's work in the 19th century contributed to the development of cell theory, along with the contributions of other scientists such as Hooke, Schleiden, and Virchow. However, it was Schwann who specifically recognized the fundamental similarity of animal tissues at the cellular level.

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46.

Viruses do not come from other viruses; they require an intermediate cell to replicate. Living things are either unicellular or multicellular. Which of the previous two statements is supported by cell theory?
- The first statement and the second statement
- The first statement only
- Both Statements are not supported by cell theory.
- The second statement only
Correct Answer

A. The second statement only

Explanation

The second statement only is supported by cell theory. Cell theory states that living things are either unicellular or multicellular, which means that viruses, being acellular, do not fall under the category of living things. Therefore, the first statement is not supported by cell theory.

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47.

Scientists used electron microscopes to identify the emerging coronavirus. Why did the invention of the microscope mainly help in identifying the coronavirus?
- Because the size of the virus is too small to visualize without the use of a microscope
- Because the virus can only be collected for identification using microscopes
- Because it is lethal to see the virus with naked eyes
- Because the structure of the virus is too complex and can only be cultured using microscopes
Correct Answer

A. Because the size of the virus is too small to visualize without the use of a microscope

Explanation

The invention of the microscope mainly helped in identifying the coronavirus because the size of the virus is too small to visualize without the use of a microscope.

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48.

The micrograph provided is of pollen grains. Which type of microscope is most likely to have been used to produce this image?
- Scanning electron microscope
- Transmission electron microscope
- Light microscope
- Simple microscope
Correct Answer

A. Scanning electron microscope

Explanation

The micrograph provided shows a highly detailed and magnified image of pollen grains. The scanning electron microscope (SEM) is the most likely type of microscope used to produce this image because it is capable of producing high-resolution images with a large depth of field. SEM uses a focused beam of electrons to scan the surface of the sample, creating a three-dimensional image. This technique is ideal for studying the surface morphology of objects, such as pollen grains, at a very high magnification.

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49.

The first to see a cell (a room), and named it a cell. He looked at a cork, saw a line of cells that reminded him of rooms …..
- Had observed the structures only in plant material.
- Deduced that all living organisms bodies are composed of cells.
- Was the second person to see the cell organelles.
- Was the first to observe the world of microscopic organisms and living cells.
Correct Answer

A. Had observed the structures only in plant material.

Explanation

The correct answer is "Had observed the structures only in plant material." This is because the passage states that the person looked at a cork and saw a line of cells, which indicates that they were observing plant material. There is no mention of them observing any other type of organism or material. Therefore, it can be deduced that their observations were limited to plant structures.

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Unit 2 Chapter 1 (1st Secondary) Biology

Which technology was essential for the development of the cell theory?

Quiz Preview

He advanced the cell theory with his conclusion that cells could only come from other cells. ……

Which is not true for the cellular theory?

The beginning unit is always a cell. It starts then from cells …....

What did Leeuwenhoek do?

Which of the following group of scientists contributed to the cell theory?

Which of the following scientists concluded that all PLANTS are made of cells?

What is one way in which all living things on Earth are alike?

He placed a slice of cork under his microscope and he called the structure observed as 'cell'. The person mentioned is …....

All the following statements are true regarding the "cell theory" except .....

The smallest unit that can perform the basic activities of life is a(an) …....

Among the disadvantages of using dyes for staining certain parts of the sample is that, dyes …..

In the comparison between light microscope (L.M) and electron microscope (E.M), one of the following comparisons is wrong ……

Cells differ from each other in the shape, structure and size because …....

A student examined some plant cells by light microscope, at the beginning he obtained the figure (A), and then he obtained the figure (B). What did he perform for obtaining the figure (B)?

Which general type of microscope a scientist would be most appropriate to use inorder to view a virus with a diameter of 80 nm.

Which of the following is a magnifying power of a light microscope?

Which of the following is not a principle that cell theory is based on?

It is known that as little as 51% of the original liver mass can regenerate back to its full size after either surgical removal or chemical injury. This agrees with the views of ------------ opinion.

An amoeba (a single-celled organism) can reproduce by replicating its genetic material and splitting in half to produce two new cells. Which principle of cell theory does this process support?

How did Antoine van Leeuwenhoek contribute to the development of cell theory?

How did Robert Hooke contribute to the development of cell theory?

One of the three major tenets of classical cell theory is that cells arise from other cells. What else is considered to be a principle of cell theory?

The wavelength of an electron beam is shorter than that of visible light. What is the advantage of using a source of illumination with a short wavelength in an electron microscope?

What is the difference between scanning electron microscopes and transmission electron microscopes?

To magnify minute objects, a light microscope uses a beam of light as a source of illumination, whereas an electron microscope uses a beam of accelerated electrons. In what other ways do they differ?

What is the advantage of a light microscope over an electron one?

Which of the following was not a major event in the history of the development of cell theory?

Bacteria, which are single-celled organisms, divide in half to make new bacteria. How is this statement related to cell theory?

How did Matthias Schleiden contribute to the development of cell theory?

Microbiology is the study of all living organisms that are too small to be visible to the naked eye. Why is Antoine van Leeuwenhoek considered the founding father of microbiology?

In blood smears, Leishman’s stain gives white blood cells different colors in a range of shades between pink, purple, and blue. Which microscope is used with this type of staining?

Which is true for the cellular theory?

Which of the following was done by T. Schwann?

Why are microscopes important when studying most cells?

In order to screen the composition of a large sized objects under light microscope, they have to be sliced into thin slices , …..

If SEM refers to scanning electron microscope and TEM refers to transmission electron microscope. The figure below represents pollen grains and white blood cells under each of the SEM and the TEM. What are A1, A2, B1 and B2?

What happens to the image of the light microscope if the ocular lens is 40X and the objective lens is 50X …….

On studying the surface of a white blood cell, which of the following should be used?

From the figure below, what is the name of the scientist who stated this principle in the cell theory?

Which of the following is the correct sequence of events for the development of cell theory?

Which of the following is used to increase the contrast between different parts of sclerenchyma tissue seen under a light microscope whose magnification power of the ocular lens is (X15) where a suitable light passes through it?

Which general type of microscope a student would be most appropriate to use inorder to view a living human egg cell (ovum) with a diameter of 100 μm.

How did Rudolf Virchow contribute to the development of cell theory?

Regarding cell theory, which of the following scientists recognized that the building units of different animal tissues are fundamentally the same?

Viruses do not come from other viruses; they require an intermediate cell to replicate. Living things are either unicellular or multicellular. Which of the previous two statements is supported by cell theory?

Scientists used electron microscopes to identify the emerging coronavirus. Why did the invention of the microscope mainly help in identifying the coronavirus?

The micrograph provided is of pollen grains. Which type of microscope is most likely to have been used to produce this image?

The first to see a cell (a room), and named it a cell. He looked at a cork, saw a line of cells that reminded him of rooms …..