Grade 8 Science:Chapter 4 Quiz Cells

1.

A plant grows roots in the direction of moist soil. What is this an example of?
- A.
  
  Living things require energy
- B.
  
  Living things respond to changes in their environment
- C.
  
  Living things have a lifespan.
- D.
  
  Living things grow in size,reproduce, and are able to repair themselves.
Correct Answer
B. Living things respond to changes in their environment

Explanation
This is an example of living things responding to changes in their environment. The plant is able to sense the presence of moist soil and grow its roots in that direction in order to obtain water and nutrients. This response to the environmental stimulus is a characteristic of living organisms, as they have the ability to detect and react to changes in their surroundings.

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2.

Which is not an example of cell theory.
- A.
  
  All living things are composed of one or more cells.
- B.
  
  The cell is the basic unit of life.
- C.
  
  The cells have a life span
- D.
  
  All cells come from pre-existing cells
Correct Answer
C. The cells have a life span

Explanation
The statement "The cells have a life span" is not an example of cell theory because cell theory does not address the lifespan of cells. Cell theory focuses on the idea that all living things are composed of cells, the cell is the basic unit of life, and all cells come from pre-existing cells. The lifespan of cells is a separate concept that is not directly related to the principles of cell theory.

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3.

What is the maximum magnification of the microscope used in the science lab?
- A.
  
  100X
- B.
  
  400X
- C.
  
  600X
- D.
  
  1000X
- E.
  
  4000X
Correct Answer
B. 400X

Explanation
The maximum magnification of the microscope used in the science lab is 400X. This means that the microscope can enlarge an object up to 400 times its actual size. This level of magnification is commonly used in scientific research and allows for detailed observation of microscopic organisms and structures.

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4.

When magnifying an object the field of view does the following:
- A.
  
  Decreases in size.
- B.
  
  Stays the same size.
- C.
  
  Increases in size.
Correct Answer
A. Decreases in size.

Explanation
When magnifying an object, the field of view decreases in size. This is because when we magnify an object, we are essentially zooming in on a smaller portion of the object, which results in a narrower field of view. As we increase the magnification, the area that we can see becomes smaller and more focused, leading to a decrease in the overall size of the field of view.

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5.

Which organelles are only found in the plant cell?
- A.
  
  Cell wall, chloroplasts, cytoplasm, vacuole
- B.
  
  Cell wall, chloroplasts, flagella, vacuole
- C.
  
  Cell wall, chloroplasts, cilia, vacuole
Correct Answer(s)
A. Cell wall, chloroplasts, cytoplasm, vacuole
B. Cell wall, chloroplasts, flagella, vacuole

Explanation
The correct answer is "Cell wall, chloroplasts, cytoplasm, vacuole." The cell wall is a rigid structure found only in plant cells that provides support and protection. Chloroplasts are organelles responsible for photosynthesis, which is a process unique to plant cells. Cytoplasm is a jelly-like substance that fills the cell and is found in all types of cells, including plant cells. Vacuoles are large membrane-bound sacs that store water, nutrients, and waste materials, and they are more prominent in plant cells compared to animal cells. The other options include flagella and cilia, which are structures involved in cell movement, but they are not specific to plant cells.

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6.

Which is not an example of an organelle?
- A.
  
  Nucleus
- B.
  
  Chromosome
- C.
  
  Vacuole
- D.
  
  Cytoplasm
Correct Answer
D. Cytoplasm

Explanation
The cytoplasm is not an example of an organelle. Organelles are specialized structures within a cell that perform specific functions. The nucleus, chromosome, and vacuole are all examples of organelles. The nucleus contains the cell's genetic material, chromosomes are structures within the nucleus that carry genes, and vacuoles are membrane-bound organelles involved in storage and waste disposal. On the other hand, the cytoplasm is the gel-like substance that fills the cell and surrounds the organelles. While it plays a crucial role in supporting the organelles, it is not considered an organelle itself.

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7.

Which organelle is found in the lungs of humans and assists to get dust out.
- A.
  
  Cilia
- B.
  
  Flagella
- C.
  
  Chloroplast
- D.
  
  Lysosome
Correct Answer
A. Cilia

Explanation
Cilia are small hair-like structures found in the lungs of humans that help to remove dust particles and other foreign substances. These tiny projections beat in coordinated motions, creating a sweeping motion that moves mucus and trapped particles out of the respiratory system. This action helps to keep the lungs clean and prevents harmful substances from entering deeper into the respiratory tract.

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8.

Which organelle is not found in the plant cell?
- A.
  
  Mitochondria
- B.
  
  Lysosome
- C.
  
  Cell membrane
- D.
  
  Flagella
- E.
  
  All are found in plant cell
Correct Answer
E. All are found in plant cell

Explanation
All of the listed organelles (mitochondria, lysosome, cell membrane, and flagella) are found in plant cells. This means that there is no organelle that is not found in a plant cell.

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9.

Which organelle can only be seen using an electron microscope?
- A.
  
  Mitochondria
- B.
  
  Vacuoles
- C.
  
  Chromosomes
- D.
  
  Chloroplast
Correct Answer
A. Mitochondria

Explanation
Mitochondria can only be seen using an electron microscope because they are very small and have a complex internal structure. Electron microscopes use a beam of electrons to create an image, which has a higher resolution than light microscopes. This allows for the visualization of smaller structures like mitochondria. Vacuoles, chromosomes, and chloroplasts can be seen using both light and electron microscopes, as they are larger and more easily observable.

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10.

Todays electron microscopes can magnify an object up to
- A.
  
  2 00 000X
- B.
  
  2 000 000X
- C.
  
  20 000 000X
- D.
  
  200 000 000X
Correct Answer
B. 2 000 000X

Explanation
Today's electron microscopes can magnify an object up to 2,000,000X.

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Grade 8 Science:Chapter 4 Quiz Cells

A plant grows roots in the direction of moist soil. What is this an example of?

Which is not an example of cell theory.

What is the maximum magnification of the microscope used in the science lab?

When magnifying an object the field of view does the following:

Which organelles are only found in the plant cell?

Which is not an example of an organelle?

Which organelle is found in the lungs of humans and assists to get dust out.

Which organelle is not found in the plant cell?

Which organelle can only be seen using an electron microscope?

Todays electron microscopes can magnify an object up to