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2Name: _________________________________ Date: ______________________
GRADE 8 SCIENCE – CELLS UNIT TEST
Multiple Choice
Answer questions 1 – 15. Write the letter corresponding to the correct answer on the blank beside the number for that
question, below (15 marks).
1. 2. 3. 4. 5. 6. 7. 8.
9. 10. 11. 12. 13. 14. 15.
1. Which of the statements below is NOT one of the key 2. When looking at the body of a multicellular organism,
ideas in cell theory? you can see different levels of organization. Which of
a) All cells divide and come from old cells. the answers below shows the correct order of levels
b) The cell is the basic unit of life. of organization from smallest to largest?
c) All living things are made up of many cells which a) cell, organ, tissue, system
are always in motion. b) cell, tissue, organ, system
d) All living things are made up of one or more cells. c) cell, organ, system, tissue
d) cell, tissue, system, organ
3. The nucleus is the “control centre” of the cell, 4. This cell structure is made up of folded membrane and
containing the genetic information in the form of… manufactures and stores lipids and steroid hormones.
a) chromosomes a) Golgi body
b) ribosomes b) lysosome
c) lysosomes c) smooth endoplasmic reticulum
d) organelles d) rough endoplasmic reticulum
5. This cell structure contains digestive enzymes and 6. In class, you got the chance to look at onion cells under
works to keep the cytoplasm clean. a microscope. Now, suppose that you scraped some
a) Golgi body cells from inside a human cheek and looked at them
b) lysosome under the microscope. Comparing the onion cells to
c) smooth endoplasmic reticulum the human cheek cells, you would expect to see cell
d) rough endoplasmic reticulum walls present in
a) cheek cells but absent in onion cells
b) onion cells but absent in cheek cells
c) both cheek cells and onion cells
d) neither cheek cells nor onion cells
7. Assume that you have a compound light microscope 8. Think about the microscopes currently in use in our
with an ocular lens that has a magnification of 10X. Its classroom. The best way to focus on a specimen using
objective lens has a magnification of 50X. What is the a microscope already set to 100X magnification is to
total magnification of the microscope? adjust the:
a) 10X a) coarse adjustment knob
b) 50X b) fine adjustment knob
c) 100X c) both a and b
d) 500X d) none of the above
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9. A scientist has discovered a new type of bacteria, and 10. A process which enables substances to spread out in a
she wants to get a detailed look at structures inside the solution until they are evenly distributed is called…
bacteria. The best microscope for this job is a a) distillation
a) compound light microscope b) dissolving
b) transmission electron microscope c) desalination
c) scanning electron microscope d) diffusion
d) none of the above
11.The cell membrane… 12. A good example of osmosis is…
a) is permeable. a) CO2 moving from the inside of a cell to the outside of
b) is selectively permeable. a cell.
b) Water moving from a high concentration outside of a
c) is moderately permeable.
cell to a low concentration inside of a cell.
d) is impermeable c) Water moving from inside a cell to outside via a
contractile vacuole.
d) O2 moving from a low concentration to a high
concentration.
13. A good example of diffusion is… 14. How do paramecia take in the nutrients they need to
a) Water moving from a high concentration outside of survive?
a cell to a low concentration inside of a cell a) through the digestive system
b) CO2 moving from the inside of a cell to the outside b) through a process called phagocytosis
of a cell. c) through a structure called the oral groove
c) O2 moving from a low concentration to a high d) through the use of flagella
concentration.
d) Water moving from inside a cell to outside via a
contractile vacuole.
15. An amoeba moves by changing its shape. It pushes its
cytoplasm against one part of its cell membrane,
causing a bulge. This bulge is called a…
a) Pseudopod
b) cilia
c) flagellum
d) fake leg
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Short Answer
Answer the following question in the space provided. You may use point form, but be sure to explain your
thinking clearly and in detail, using scientific vocabulary.
1. Predict what would happen to a cell in each of the cases below. Be sure to explain your thinking clearly! (4
marks).
a) The cell’s nucleus stops working.
b) The cell’s membrane becomes completely impermeable.
Analysis Question – Answer the question below, remembering to explain your thinking clearly using scientific
concepts and to use scientific vocabulary when possible. Remember to follow the success criteria!
Mrs. Williams loves All-Dressed potato chips. In fact, she scarfed down a whole family-sized bag! About 30
minutes later, she became so thirsty that she drank a whole jug of water! Wow! Based on what you have
learned about diffusion and osmosis, why eating all the potato chips made her so thirsty?
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Success Criteria -- Analysis Question
Knowledge and Understanding
● Your answer shows a clear understanding of important concepts from the unit.
● You back up your thinking using specific details from the unit (e.g., facts, models, theories, etc.).
● You use correct science terminology
Communication
● You express your ideas clearly and in a logical order.
● As much as possible, spelling and grammar are correct.
Analyze and Evaluate
2. Describe similarities and differences in the shape and arrangement of the plant and
animal cells that you observed.
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3. What are some of the advantages and limitations of viewing cells under high power?
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4. Why is it important to create biological drawings that accurately represent what you
see?
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4
5 Describe the process of diffusion using the particle theory (see p. 121) in your own words.
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• How is the movement of particles in diffusion determined?
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• Give two examples in your everyday experience where diffusion occurs. Can you think of a
situation where this might be harmful?
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• The concentrations of sodium inside and outside a cell are equal. If two sodium particles
pass through the cell membrane and enter the cell, how many sodium particles must exit the
cell? Explain.
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