▎Multiple-Choice Questions
1. What is the primary pigment involved in photosynthesis?
• A) Carotene
• B) Chlorophyll
• C) Xanthophyll
• D) Anthocyanin
2. Where in the plant does photosynthesis primarily take place?
• A) Roots
• B) Stems
• C) Leaves
• D) Flowers
3. Which of the following is a product of photosynthesis?
• A) Oxygen
• B) Carbon dioxide
• C) Glucose
• D) Both A and C
4. What are the raw materials for photosynthesis?
• A) Water and oxygen
• B) Carbon dioxide and glucose
• C) Water and carbon dioxide
• D) Glucose and oxygen
5. In which part of the chloroplast do the light-dependent reactions occur?
• A) Stroma
• B) Thylakoid membranes
• C) Cytoplasm
• D) Matrix
6. What is the main purpose of the Calvin cycle?
• A) To produce ATP
• B) To fix carbon dioxide into glucose
• C) To absorb light energy
• D) To release oxygen
7. Which gas is released as a byproduct of photosynthesis?
• A) Nitrogen
• B) Oxygen
• C) Methane
• D) Carbon dioxide
8. What is photoinhibition?
• A) Enhanced photosynthesis due to high light intensity
• B) Damage to the photosynthetic apparatus caused by excessive light
• C) Increased carbon fixation in low light conditions
• D) The ability of plants to adapt to low light
9. Which type of plant uses the C4 pathway for photosynthesis?
• A) Wheat
• B) Rice
• C) Sugarcane
• D) Barley
10. How does temperature affect the rate of photosynthesis?
• A) It has no effect.
• B) It increases indefinitely with temperature.
• C) It increases to an optimal point and then decreases.
• D) It only affects light-dependent reactions.
11. Which of the following factors does NOT affect the rate of photosynthesis?
• A) Light intensity
• B) Water availability
• C) Soil pH
• D) Carbon dioxide concentration
12. What is the role of NADPH in photosynthesis?
• A) To transport oxygen
• B) To store energy for use in the Calvin cycle
• C) To absorb light energy
• D) To release carbon dioxide
13. What is the significance of photosynthesis in ecosystems?
• A) It produces food for herbivores.
• B) It generates oxygen for aerobic organisms.
• C) It helps regulate atmospheric carbon dioxide.
• D) All of the above.
14. Which of the following statements about CAM plants is true?
• A) They perform photosynthesis only at night.
• B) They fix carbon dioxide during the day.
• C) They are adapted to wet environments.
• D) They do not require sunlight for photosynthesis.
15. What is the effect of deforestation on global photosynthesis rates?
• A) It increases photosynthesis rates.
• B) It has no effect on global rates.
• C) It decreases photosynthesis rates.
• D) It only affects local rates.
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1. What is the primary pigment involved in photosynthesis?
• A) Carotene
• B) Chlorophyll
• C) Xanthophyll
• D) Anthocyanin
2. Where in the plant does photosynthesis primarily take place?
• A) Roots
• B) Stems
• C) Leaves
• D) Flowers
3. Which of the following is a product of photosynthesis?
• A) Oxygen
• B) Carbon dioxide
• C) Glucose
• D) Both A and C
4. What are the raw materials for photosynthesis?
• A) Water and oxygen
• B) Carbon dioxide and glucose
• C) Water and carbon dioxide
• D) Glucose and oxygen
5. In which part of the chloroplast do the light-dependent reactions occur?
• A) Stroma
• B) Thylakoid membranes
• C) Cytoplasm
• D) Matrix
6. What is the main purpose of the Calvin cycle?
• A) To produce ATP
• B) To fix carbon dioxide into glucose
• C) To absorb light energy
• D) To release oxygen
7. Which gas is released as a byproduct of photosynthesis?
• A) Nitrogen
• B) Oxygen
• C) Methane
• D) Carbon dioxide
8. What is photoinhibition?
• A) Enhanced photosynthesis due to high light intensity
• B) Damage to the photosynthetic apparatus caused by excessive light
• C) Increased carbon fixation in low light conditions
• D) The ability of plants to adapt to low light
9. Which type of plant uses the C4 pathway for photosynthesis?
• A) Wheat
• B) Rice
• C) Sugarcane
• D) Barley
10. How does temperature affect the rate of photosynthesis?
• A) It has no effect.
• B) It increases indefinitely with temperature.
• C) It increases to an optimal point and then decreases.
• D) It only affects light-dependent reactions.
11. Which of the following factors does NOT affect the rate of photosynthesis?
• A) Light intensity
• B) Water availability
• C) Soil pH
• D) Carbon dioxide concentration
12. What is the role of NADPH in photosynthesis?
• A) To transport oxygen
• B) To store energy for use in the Calvin cycle
• C) To absorb light energy
• D) To release carbon dioxide
13. What is the significance of photosynthesis in ecosystems?
• A) It produces food for herbivores.
• B) It generates oxygen for aerobic organisms.
• C) It helps regulate atmospheric carbon dioxide.
• D) All of the above.
14. Which of the following statements about CAM plants is true?
• A) They perform photosynthesis only at night.
• B) They fix carbon dioxide during the day.
• C) They are adapted to wet environments.
• D) They do not require sunlight for photosynthesis.
15. What is the effect of deforestation on global photosynthesis rates?
• A) It increases photosynthesis rates.
• B) It has no effect on global rates.
• C) It decreases photosynthesis rates.
• D) It only affects local rates.
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▎Answers
1. B) Chlorophyll
2. C) Leaves
3. D) Both A and C
4. C) Water and carbon dioxide
5. B) Thylakoid membranes
6. B) To fix carbon dioxide into glucose
7. B) Oxygen
8. B) Damage to the photosynthetic apparatus caused by excessive light
9. C) Sugarcane
10. C) It increases to an optimal point and then decreases.
11. C) Soil pH
12. B) To store energy for use in the Calvin cycle
13. D) All of the above.
14. A) They perform photosynthesis only at night.
15. C) It decreases photosynthesis rates.
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