Plant And Animal Cell Quiz For Grade 7
(512).jpg "Plant And Animal Cell Quiz For Grade 7 - Quiz")
We all have learned the cell structure in school, right? Today, let's revise that concept. Try this 'Plant and animal cell quiz designed for grade 7 students. In this assessment test, we will ask you a few basic questions about plant and animal cells and their functions. You just have to pick the answer that looks the most appropriate to you. So, are you ready to assess your knowledge? Let's get started then. Good luck, in advance!
Questions and Answers
- 1.
All cells arise from ___________.
- A.
Atoms
- B.
Molecules
- C.
Pre-existing cells
- D.
Ammonia
Correct Answer
C. Pre-existing cellsExplanation
All cells arise from pre-existing cells because of the principle of biogenesis, which states that living organisms can only arise from other living organisms. This principle was established through experiments conducted by Louis Pasteur in the 19th century, where he disproved the theory of spontaneous generation. Therefore, the correct answer is pre-existing cells.Rate this question:
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- 2.
Plant cells contain _____ which helps the process of photosynthesis.
- A.
Vacuole
- B.
Chlorophyll
- C.
Cell wall
- D.
Mitochondrial
Correct Answer
B. ChlorophyllExplanation
Chlorophyll is the pigment found in plant cells that is responsible for capturing sunlight and converting it into energy through the process of photosynthesis. It is located in the chloroplasts, which are specialized organelles within the cell. Chlorophyll absorbs light energy and uses it to synthesize glucose, a form of stored energy, from carbon dioxide and water. This process is essential for plants to produce their own food and release oxygen as a byproduct.Rate this question:
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- 3.
Cells were first discovered by ________.
- A.
Charles Darwin
- B.
Isaac Newton
- C.
Robert Hooke
- D.
John Darton
Correct Answer
C. Robert HookeExplanation
Robert Hooke is the correct answer because he was the first person to observe and describe cells in 1665. He used a microscope to examine thin slices of cork and noticed small compartments that he called "cells," because they reminded him of the small rooms monks lived in. Hooke's discovery of cells was a significant contribution to the field of biology and laid the foundation for the development of the cell theory.Rate this question:
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- 4.
Which of the following cell structures is peculiar to plant cells?
- A.
Cell membrane
- B.
Cytoplasm
- C.
Cell wall
- D.
Vacuoles
Correct Answer
C. Cell wallExplanation
The cell wall is peculiar to plant cells because it provides rigidity and support to the cell, which is necessary for the upright growth of plants. It is composed of cellulose and other polysaccharides, and it surrounds the cell membrane. Unlike animal cells, plant cells have a cell wall in addition to a cell membrane. The cell wall also helps protect the cell from mechanical stress and provides a barrier against pathogens.Rate this question:
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- 5.
The living portion of the cell is called...
- A.
Cytoplasm
- B.
Protoplasm
- C.
Cyst
- D.
Nucleus
Correct Answer
B. ProtoplasmExplanation
Protoplasm is the correct answer because it refers to the living portion of the cell. It includes the cytoplasm and the nucleus, which are responsible for carrying out the cell's functions and containing its genetic material. The term "cytoplasm" alone does not encompass the entire living portion of the cell, as it does not include the nucleus. "Cyst" is not related to the living portion of the cell, and the "nucleus" is only a part of the living portion, not the entire thing.Rate this question:
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- 6.
Somatic cells undergo...
- A.
Mitosis
- B.
Moisis
- C.
Change
- D.
None of the above
Correct Answer
A. MitosisExplanation
Somatic cells undergo mitosis, which is a type of cell division that results in two identical daughter cells. This process is essential for growth, repair, and maintenance of the body. During mitosis, the genetic material is duplicated and evenly distributed to each daughter cell, ensuring that they have the same genetic information as the parent cell. This allows somatic cells to continually replace damaged or old cells, ensuring the proper functioning of tissues and organs. Moisis is not a recognized term in biology, and "change" is too vague to be a correct answer. Therefore, the correct answer is mitosis.Rate this question:
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- 7.
Which cell structure is regarded as the power house of the cell?
- A.
Endoplasmic reticulum
- B.
Ribosome
- C.
Nucleus
- D.
Mitochondria
Correct Answer
D. MitochondriaExplanation
Mitochondria are regarded as the powerhouses of the cell because they are responsible for producing the majority of the cell's energy in the form of ATP through a process called cellular respiration. They have their own DNA and can self-replicate, which suggests that they were once independent organisms that formed a symbiotic relationship with eukaryotic cells. Mitochondria have a highly folded inner membrane that increases their surface area, allowing for more efficient ATP production.Rate this question:
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- 8.
All parts of the cell surrounded by plasma lemma except except the nucleus is called...
- A.
Protoplasm
- B.
Cytoplasm
- C.
Nucleus membrane
- D.
Chromosomes
Correct Answer
B. CytoplasmExplanation
The correct answer is Cytoplasm. The cytoplasm refers to all the contents of a cell that are enclosed by the plasma membrane, excluding the nucleus. It includes various organelles, such as mitochondria and ribosomes, as well as a gel-like substance called the cytosol. The cytoplasm plays a crucial role in supporting cellular processes and providing a medium for biochemical reactions to occur.Rate this question:
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- 9.
Which of the following is referred to as the electrically neutral group of two or more atoms held together by chemical bonds?
- A.
Atom
- B.
Cells
- C.
Molecules
- D.
Ions
Correct Answer
C. MoleculesExplanation
Molecules are referred to as the electrically neutral group of two or more atoms held together by chemical bonds. In a molecule, the atoms share electrons to form stable bonds, resulting in a neutral overall charge. This is in contrast to ions, which have a positive or negative charge due to the loss or gain of electrons. Atoms are individual particles, while cells are the basic structural and functional units of living organisms.Rate this question:
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- 10.
Which of the following organelles have similarities to a prokaryotic cell?
- A.
Mitochondria
- B.
Chloroplast
- C.
Both mitochondria and chloroplast
- D.
None of the above
Correct Answer
C. Both mitochondria and chloroplastExplanation
Both mitochondria and chloroplasts have similarities to prokaryotic cells because they both have their own DNA and ribosomes, which are similar to those found in prokaryotic cells. Additionally, both organelles are believed to have originated from endosymbiotic events where prokaryotic cells were engulfed by a eukaryotic cell and formed a symbiotic relationship. This is supported by the fact that mitochondria and chloroplasts have their own membranes and can replicate independently of the cell they reside in.Rate this question:
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- 11.
What does the cell wall of a plant composed of?
- A.
Carbohydrates
- B.
Proteins
- C.
Cellulose
- D.
Lipids
Correct Answer
C. CelluloseExplanation
The cell wall of a plant is composed of cellulose. Cellulose is a complex carbohydrate that provides structural support to the plant cell. It forms a rigid and strong framework around the cell membrane, allowing the plant to maintain its shape and withstand mechanical stress. Cellulose is made up of long chains of glucose molecules that are interconnected, forming a mesh-like structure. This composition of cellulose gives the plant cell wall its strength and durability.Rate this question:
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- 12.
Structures in a cell are called ___________.
- A.
Organelles
- B.
Cytoplasm
- C.
Cell wall
- D.
Membrane
Correct Answer
A. OrganellesExplanation
Structures in a cell are called organelles. Organelles are specialized structures within a cell that perform specific functions. They are like tiny organs within a cell, each with its own specific role. Examples of organelles include the nucleus, mitochondria, endoplasmic reticulum, Golgi apparatus, and lysosomes. These organelles work together to carry out various cellular processes and maintain the overall functioning of the cell.Rate this question:
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- 13.
The outermost covering of a plant cell constitutes ________.
- A.
Lignin
- B.
Cellulose
- C.
Cytoplasm
- D.
None of the above
Correct Answer
B. CelluloseExplanation
Cellulose is the correct answer because it is the main component of the cell wall, which is the outermost covering of a plant cell. Cellulose provides structural support and rigidity to the cell, helping to maintain its shape and protect it from external factors. Lignin is also present in the cell wall but is not the main component. Cytoplasm is the jelly-like substance inside the cell, not the outer covering. None of the above is incorrect because cellulose is indeed the correct answer.Rate this question:
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- 14.
What is the number of DNA molecules present in each chromosome?
- A.
10
- B.
15
- C.
1
- D.
Infinite
Correct Answer
C. 1Explanation
Each chromosome contains one DNA molecule.Rate this question:
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- 15.
Which of these is a unicellular organism?
- A.
Earthworm
- B.
Snails
- C.
Amoeba
- D.
Elephant
Correct Answer
C. AmoebaExplanation
Amoeba is a unicellular organism because it consists of only one cell. Unlike earthworms, snails, and elephants, which are multicellular organisms made up of many cells, amoeba is a single-celled organism that can perform all necessary functions of life within that one cell. Amoeba is a protist, a group of eukaryotic microorganisms, and it is known for its ability to change shape and move using pseudopods.Rate this question:
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(505).jpg "All cells arise from ___________.")
(515).jpg "Plant cells contain _____ which helps the process of photosynthesis.")
(503).jpg "Cells were first discovered by ________.")
(505).jpg "Which of the following cell structures is peculiar to plant cells?")
(508).jpg "The living portion of the cell is called...")
(510).jpg "Somatic cells undergo...")
(507).jpg "Which cell structure is regarded as the power house of the cell?")
(506).jpg "All parts of the cell surrounded by plasma lemma except except the nucleus is called...")
(515).jpg "Which of the following is referred to as the electrically neutral group of two or more atoms held together by chemical bonds?")
(509).jpg "Which of the following organelles have similarities to a prokaryotic cell?")
(501).jpg "What does the cell wall of a plant composed of?")
(496).jpg "Structures in a cell are called ___________.")
(497).jpg "The outermost covering of a plant cell constitutes ________.")
(486).jpg "What is the number of DNA molecules present in each chromosome?")
(503).jpg "Which of these is a unicellular organism?")
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