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.

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.

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