Photosynthesis Quiz - CBSE Class 7 Science

Free practice quiz: Photosynthesis (CBSE Class 7 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 7 Science practice quiz has 20 multiple-choice questions on Photosynthesis, and 20 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What is the primary function of photosynthesis?

   1. Convert light energy into chemical energy
   2. Convert water into oxygen
   3. Store energy in the form of ATP
   4. Release carbon dioxide
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   Answer: A. Convert light energy into chemical energy

   Photosynthesis is the process by which green plants use sunlight to synthesize nutrients from carbon dioxide and water. It primarily converts light energy into chemical energy stored as glucose.

2. Which of the following is not a raw material for photosynthesis?

   1. Carbon dioxide
   2. Water
   3. Oxygen
   4. Sunlight
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   Answer: C. Oxygen

   Oxygen is not a raw material but a byproduct of photosynthesis. The raw materials are carbon dioxide, water, and sunlight.

3. What is the role of chlorophyll in photosynthesis?

   1. Absorbs sunlight
   2. Carries nutrients
   3. Enables respiration
   4. Stores energy
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   Answer: A. Absorbs sunlight

   Chlorophyll absorbs sunlight, which is then used to convert carbon dioxide and water into glucose and oxygen in photosynthesis.

4. Which scientist is known for discovering the process of photosynthesis?

   1. Gregor Mendel
   2. Isaac Newton
   3. Joseph Priestley
   4. Antoine Lavoisier
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   Answer: C. Joseph Priestley

   Joseph Priestley is credited with discovering oxygen and proposing its role in photosynthesis through his experiments.

5. In photosynthesis, where does the water splitting occur?

   1. Mitochondria
   2. Chloroplast grana
   3. Stroma
   4. Nucleus
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   Answer: B. Chloroplast grana

   Water splitting occurs in the thylakoid membranes of chloroplasts, found in the grana, releasing oxygen, electrons, and protons.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which pigment is responsible for capturing light energy in plants?
2. Where in the plant cell does photosynthesis primarily occur?
3. What are the end products of photosynthesis?
4. What gas is taken in by plants during photosynthesis?
5. Why is photosynthesis important for life on Earth?
6. Which factor does not directly affect the rate of photosynthesis?
7. During photosynthesis, what happens to the oxygen in water molecules?
8. How does carbon dioxide enter the plant?
9. In which part of the plant does the light-independent reaction occur?
10. Which component of the photosynthesis equation is considered a byproduct?
11. What is the initial source of energy for photosynthesis?
12. What role does NADPH play in photosynthesis?
13. What is the effect of temperature on the rate of photosynthesis?
14. How is excess glucose stored in plants?
15. Which statement about the Calvin cycle is true?

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