Question

If cohesion-tension transpiration pull theory is correct, a break in water column should

• A. Increase water content of leaves
• B. Increase rate of photosynthesis
• C. Cause wilting of leaves
• D. Have no effect at all

Answer 1

The correct option is C Cause wilting of leaves

During the ascent of sap, the continuous water column is required. This is provided by the cohesive and adhesive forces between the water molecules. Due to the cohesive forces between the water molecules, the water column does not break. However, a break in the water column will result in the hindrance in the ascent of sap. This causes the wilting of leaves due to the inadequate water supply. There will be a loss of turgidity of leaves. This will result in the drooping, rolling and folding of leaves.

Thus, the correct answer is option C.