Transpiration Quiz
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5 questions, one answer each
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1. What is transpiration?
- A. The uptake of water by roots
- B. The loss of water vapour from the leaves
- C. The movement of sucrose in phloem
- D. The absorption of minerals from soil
2. Through which structures does water vapour leave the leaf?
- A. Xylem vessels
- B. Root hairs
- C. Stomata
- D. Lacteals
3. How does an increase in wind speed affect the rate of transpiration?
- A. It decreases it by trapping water vapour near the leaf
- B. It increases it by removing water vapour from around the stomata
- C. It has no effect
- D. It stops transpiration completely
4. How does increased humidity affect transpiration rate, and why?
- A. It increases it, because more water is available
- B. It decreases it, because the concentration gradient for water vapour diffusion is reduced
- C. It increases it, because stomata open wider
- D. It has no effect on transpiration
5. A plant in a hot, dry, windy environment is losing water faster than its roots can absorb it. What is the most likely outcome, and why?
- A. Increased turgor pressure, because cells gain water
- B. Wilting, because loss of turgor pressure causes stems and leaves to droop
- C. Faster photosynthesis, because stomata open wider
- D. No visible effect on the plant