Phenyl mercuric acetate is used as an:

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(A) Phenyl mercuric acetate $(PMA)$ is a well-known antitranspirant.It works by inducing the partial closure of stomata in plants.By reducing the aper

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Antitranspirant to reduce transpiration rate

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(A) Phenyl mercuric acetate $(PMA)$ is a well-known antitranspirant.It works by inducing the partial closure of stomata in plants.By reducing the aperture of the stomata,it significantly lowers the rate of transpiration without severely affecting other physiological processes like photosynthesis or respiration.Therefore,the correct option is $A$.

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