Stomatal transpiration is __________ of total transpiration
Correct answer: A. 90%
- A. 90%
- B. 91%
- C. 93%
- D. 95%
Explanation
Stomata are the main pathway for water vapour leaving a leaf, so stomatal transpiration is commonly estimated at about 90% of total transpiration. The remaining water loss occurs mainly through the cuticle and lenticels. Students may choose 95% because stomata are the dominant route, but the standard approximate value used here is 90%.
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