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Question

Why is some KOH placed in a small test tube in the flask with germinating seeds in the experiment to demonstrate occurrence of respiration in germinating seeds?
(1) To provide oxygen required by the seeds for respiration.
(2) To absorb carbon dioxide and create partial vacuum in the flask.
(3) To absorb water from the seeds to make them dry.
(4) To make the air present in the flask alkaline.

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Solution

KOH is placed in the small tube to absorb carbon dioxide and create partial vacuum in the flask. This absorption of CO2 by KOH creates partial vacuum in the flask resulting in increase in the water level in the bent tube.

Hence, the correct answer is option 2.

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