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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About Biological Importance of Water
Water supports life through its polarity, hydrogen bonding and ability to dissolve ionic and polar substances. Its high specific heat, heat of vaporization, cohesion, adhesion and incompressibility help regulate temperature, transport materials and maintain structure, while hydrolysis and osmosis depend directly on water.
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