Which of the following statements ls true about transpiration? It is the

Step 1: Analyze the question You are asked to pick the true statement defining transpiration.

Step 2: The concept Transpiration is the loss of water in the form of water vapour from the aerial parts of a plant. Most of this happens through the stomata on the leaf surface (stomatal transpiration). Smaller amounts are lost through the cuticle (cuticular transpiration) and the lenticels on stems (lenticular transpiration).

Step 3: Evaluate each option

• A. Loss of water in the form of vapour from the surface of the leaf. This is correct. It matches the definition, since the leaf is the main site of transpiration.
• B. Loss of water vapour from the surface of the root. This is wrong. Roots absorb water, and they are not the site of transpiration.
• C. Absorption of water in the form of vapour from the body of the plant. This is wrong. Transpiration is a loss of water, not absorption.
• D. Movement of water through the body of the plant. This is wrong. It describes the transpiration stream, or water movement through the xylem. That movement is a result of transpiration, but it is not the definition of it.

Step 4: Answer The correct option is A.

Tip: Remember that transpiration = evaporation of water from the leaves. If an option says "root" or "absorption", eliminate it. Also be careful with "movement of water through the plant", which is the translocation/transpiration stream, not transpiration itself.