Roots of a plant when kept in a phenolphthale | vedclass

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(C) Phenolphthalein is a pH indicator that turns pink in an alkaline solution. When plant roots are placed in this solution,they perform cellular resp

Vedclass · Accepted Answer

Respiration of roots

Vedclass · Answer

(C) Phenolphthalein is a pH indicator that turns pink in an alkaline solution. When plant roots are placed in this solution,they perform cellular respiration. During respiration,roots release $CO_2$ into the surrounding medium. This $CO_2$ reacts with water to form carbonic acid $(H_2CO_3)$,which neutralizes the alkali in the solution. As the alkalinity decreases,the pH drops,causing the phenolphthalein to lose its pink color and become colorless.

Roots of a plant when kept in a phenolphthalein-containing weak alkaline solution,decolorize it. This is due to:

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