Photosynthesis Test Questions

 

1. What is photosynthesis?

Ans: Photosynthesis is the process by which plants, algae, and some bacteria convert light energy from the sun into chemical energy stored in organic compounds such as glucose.

2. What are the reactants of photosynthesis?

Ans: The reactants of photosynthesis are carbon dioxide (CO₂) and water (H₂O), which are used to produce glucose (C₆H₁₂O₆) and oxygen (O₂).

3. What pigment is responsible for absorbing light in photosynthesis?

Ans: Chlorophyll, a green pigment found in chloroplasts, is primarily responsible for absorbing light in photosynthesis.

4. Where does photosynthesis take place in a plant cell?

Ans: Photosynthesis takes place in chloroplasts, which are specialized organelles found in the mesophyll cells of leaves.

5. How does photosynthesis benefit the environment?

Ans: Photosynthesis provides the oxygen we breathe and removes carbon dioxide from the atmosphere, contributing to the regulation of Earth's climate. Additionally, photosynthesis is the basis of the food chain, providing energy and organic compounds for all higher organisms.

6. What is the chemical equation for photosynthesis?

Ans: The chemical equation for photosynthesis is: 6 CO2 + 6 H2O + light energy → C6H12O6 + 6 O2.

7. What is the role of chlorophyll in photosynthesis?

Ans: Chlorophyll absorbs light energy, which is then used to drive the chemical reactions of photosynthesis.

8. What are the end products of photosynthesis?

Ans: The end products of photosynthesis are glucose (C6H12O6), a sugar that serves as a source of energy for the plant, and oxygen (O2), which is released into the atmosphere.

9. Where does photosynthesis take place in a plant cell?

Ans: Photosynthesis takes place in chloroplasts, which are specialized organelles found in the mesophyll cells of leaves.

10. What is the source of energy for photosynthesis?

Ans: The source of energy for photosynthesis is light, primarily from the sun.

11. What is the role of carbon dioxide in photosynthesis?

Ans: Carbon dioxide (CO2) is a reactant in photosynthesis and is used to produce glucose.

12. What is the role of water in photosynthesis?

Ans: Water (H2O) is a reactant in photosynthesis and is used to produce oxygen.

13. How does the process of photosynthesis benefit the environment?

Ans: Photosynthesis provides the oxygen we breathe and removes carbon dioxide from the atmosphere, contributing to the regulation of Earth's climate. Additionally, photosynthesis is the basis of the food chain, providing energy and organic compounds for all higher organisms.

14. What is the Calvin cycle?

Ans: The Calvin cycle is the series of chemical reactions in photosynthesis that convert carbon dioxide into glucose.

15. What are stomata?

Ans: Stomata are tiny pores on the leaves of plants that allow for the exchange of gases, including carbon dioxide and oxygen, between the plant and the atmosphere.

16. What is the role of ATP in photosynthesis?

Ans: ATP (adenosine triphosphate) is used as an energy source in photosynthesis to drive the chemical reactions that produce glucose and oxygen.

17. What is the role of NADPH in photosynthesis?

Ans: NADPH (nicotinamide adenine dinucleotide phosphate) is used as an energy source in photosynthesis to drive the chemical reactions that produce glucose and oxygen.

18. What is the role of ribulose bisphosphate (RuBP) in photosynthesis?

Ans: Ribulose bisphosphate (RuBP) is a reactant in the Calvin cycle of photosynthesis and is used to produce glucose.

19. What are the three stages of photosynthesis?

Ans: The three stages of photosynthesis are the light-dependent reactions, the production of ATP and NADPH, and the Calvin cycle.

20. What is photophosphorylation?

Ans: Photophosphorylation is the process of converting light energy into chemical energy in the form of ATP and NADPH, which are used in the later stages of photosynthesis.

21. What is the difference between C3 and C4 photosynthesis?

Ans: C3 photosynthesis is the process by which plants take in carbon dioxide through their stomata and convert it into glucose. C4 photosynthesis is a modified form of C3 photosynthesis that is more efficient in hot and arid conditions.