Read the below statements about transpiration: 1. Transpiration is highest in dry and windy conditions. Which of the above statements are correct?
2. It helps in the ascent of sap through cohesion-tension.
3. Transpiration always results in wilting.
Only 1 and 2 are correct
Statement 1 is correct — Transpiration is highest in dry, hot, windy, and low-humidity conditions because these increase the vapour pressure gradient between the leaf interior and the atmosphere.
Statement 2 is correct — Transpiration creates a tension (negative pressure) in the xylem that pulls water upward through cohesion-tension mechanism, facilitating the ascent of sap.
Statement 3 is incorrect — Transpiration does not always result in wilting. Wilting occurs only when water loss exceeds water absorption. Under normal conditions, the plant's water uptake matches transpiration losses.
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