Question

Which of the following substances serve as an anti-transpirant in plant?

• A. Phenyl mercuric acetate
• B. Asprin
• C. Silicon oil
• D. All of the above

Answer 1

Answer: (D)

All of the above

Anti-transpirants are the compounds which reduce transpiration when applied to the plant leaves.

Anti-transpirants are of two types;

• Metabolic Inhibitors, that can reduce/block stomatal opening and/or resist diffusion of water vapor. Examples; Phenyl mercuric acetate, Asprin.
• Film-forming anti-transpirants, that form a layer over leaf surface which blocks water vapor diffusion. Examples; Silicon oil.
• So the correct option is "All of the above".