Grade 7 Science Practice Test: Photosynthesis and Cellular Respiration
- Photosynthesis and Cellular Respiration
- 10 questions
- 13 minutes
Ten questions on how plants make food and how all living cells release energy from it. Tip: the products of one process are the starting materials of the other.
Tap an option to mark your answer. You can change your mind, or tap the same option again to leave the question blank. The correct answers and explanations appear when you finish the test.Tap an option to answer; tap it again to leave the question blank.
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Question 1
Which two substances does a plant use as raw materials for photosynthesis?
Correct answer: C
Plants take in carbon dioxide from the air and water from the soil and use light energy to turn them into sugar. Oxygen and sugar are the products, not the raw materials.
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Question 2
What are the products of photosynthesis?
Correct answer: A
Photosynthesis makes sugar (glucose), which stores energy, and releases oxygen as a by-product. Carbon dioxide and water are what go in.
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Question 3
Where does the energy that drives photosynthesis come from?
Correct answer: B
Chlorophyll in the chloroplasts absorbs light energy and stores it in sugar. Soil supplies water and minerals but not energy.
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Question 4
In which living things does cellular respiration take place?
Correct answer: D
All living cells, including plant cells, need to release energy from sugar, so they all carry out cellular respiration. Thinking plants only photosynthesize is a common mistake.
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Question 5
Which gas do cells give off as a waste product of cellular respiration?
Correct answer: B
Cellular respiration uses oxygen to break down sugar and releases carbon dioxide and water. You breathe out that carbon dioxide.
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Question 6
A water plant in a sunny tank gives off small bubbles from its leaves. Which gas is mainly in these bubbles?
Correct answer: A
In light, the plant carries out photosynthesis and releases oxygen. If the tank is moved into the dark, the bubbling slows or stops.
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Question 7
A healthy plant is sealed in a clear jar and placed in bright sunlight for a few hours. What most likely happens to the amount of oxygen in the jar?
Correct answer: C
In bright light, photosynthesis releases more oxygen than the plant's respiration uses, so oxygen builds up. Plants do use some oxygen, day and night, for respiration.
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Question 8
In which part of a plant cell does photosynthesis happen?
Correct answer: D
Chloroplasts contain chlorophyll, which captures light. Mitochondria carry out respiration, not photosynthesis.
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Question 9
The energy your leg muscles use to kick a ball is released when your cells break down which substance?
Correct answer: C
Cellular respiration releases the energy stored in glucose. Oxygen is needed for the process, but the energy itself was stored in the sugar.
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Question 10
How are photosynthesis and cellular respiration related?
Correct answer: B
Photosynthesis turns carbon dioxide and water into sugar and oxygen; respiration turns sugar and oxygen back into carbon dioxide and water. Only photosynthesis uses sunlight.
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