A) Cobalt chloride
B) Naphthol acetic acid
C) Calcium carbonate
D) Phenyl mercuric acetate
Correct Answer: D
Solution :
The chemical substancs which reduce. The rate of transpiration without affecting gaseous exchange are called anti-transpirants. They are placed in to cateogries : [a] Metabolic inhibitors : These chemicals causing partial closure of stomata without influencing other metabolic process, e.g., phenyl mercuric acetate (PMA) abscisic acid (ABA). [b]Film forming : Thesechemicals reduce the rate of transpiration by forming a thin transparent film on the transpiring surface. The important one are silicon emulsion, clourless palstic resins and low viscosity waxes.
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