Leaf structure and factors affecting photosynthesis Quiz
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5 questions, one answer each
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1. Which tissue carries sugars away from the leaf?
- A. Xylem
- B. Phloem
- C. Palisade layer
- D. Epidermis
2. A graph of photosynthesis rate against light intensity levels off. What does this show?
- A. Light is still the limiting factor
- B. The leaf has died
- C. Another factor is now limiting the rate
- D. Photosynthesis has stopped completely
3. Why are palisade cells packed closely together near the top of the leaf?
- A. To absorb as much light as possible with many chloroplasts
- B. To let gases diffuse through large air spaces
- C. To carry water
- D. To make the leaf waterproof
4. What happens to the stomata when guard cells lose water?
- A. They open wider
- B. They close
- C. They carry sugars
- D. They absorb more light
5. Which change would increase the rate of photosynthesis if carbon dioxide concentration is the limiting factor?
- A. Increasing the light intensity
- B. Increasing the temperature to 60 °C
- C. Increasing the carbon dioxide concentration
- D. Covering the leaf