Leaf Structure Quiz
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5 questions, one answer each
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1. Which of the following best explains why leaves have a large surface area and thin structure?
- A. To maximise light absorption and gas exchange for photosynthesis
- B. To reduce water loss through transpiration
- C. To provide structural support for the plant stem
- D. To store glucose produced during photosynthesis
2. Which tissue in a dicotyledonous leaf is responsible for most of the photosynthesis?
- A. Spongy mesophyll
- B. Palisade mesophyll
- C. Upper epidermis
- D. Vascular bundles
3. What is the function of guard cells in the leaf?
- A. To produce glucose during photosynthesis
- B. To transport water and mineral ions throughout the leaf
- C. To control the opening and closing of stomata for gas exchange
- D. To protect the leaf from pathogenic bacteria and fungi
4. The cuticle and upper epidermis of a leaf are adapted for photosynthesis in which of the following ways?
- A. They contain chloroplasts to perform photosynthesis directly
- B. They allow light penetration whilst providing protection from water loss
- C. They transport glucose and other dissolved substances
- D. They absorb mineral ions from the soil
5. How do the air spaces within spongy mesophyll contribute to the leaf's adaptation for photosynthesis?
- A. They provide structural rigidity to prevent the leaf from wilting
- B. They increase surface area for gas exchange and allow rapid diffusion of CO₂ to photosynthetic cells
- C. They store water during periods of drought
- D. They contain chlorophyll to increase light absorption