Limiting factors in photosynthesis Quiz
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5 questions, one answer each
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1. A rate against light intensity graph levels off at high light intensity. Which statement is correct?
- A. Light is the limiting factor
- B. Another factor is now limiting
- C. Photosynthesis has stopped
- D. Chlorophyll is denatured
2. What happens to the concentration of GP when light intensity is very low?
- A. It rises
- B. It falls
- C. It is unchanged
- D. It becomes RuBP
3. Why does the rate of photosynthesis fall at 50 °C?
- A. Light intensity falls
- B. Carbon dioxide is used up
- C. Enzymes are denatured
- D. Chlorophyll absorbs less light
4. A grower doubles the carbon dioxide concentration but the rate does not change. The most likely reason is that...
- A. carbon dioxide was not limiting
- B. carbon dioxide is not used by plants
- C. the temperature was too low to matter
- D. carbon dioxide cannot dissolve
5. Which is the best way to judge whether a glasshouse practice is worthwhile?
- A. Choose the cheapest
- B. Compare the extra income with the extra cost
- C. Choose the one that raises temperature most
- D. Use as many practices as possible