Question

The function of potassium hydroxide (KOH) is to

• A. Release oxygen for respiration.
• B. Remove water vapor from the flask.
• C. Enhance respiration.
• D. Absorb carbon dioxide released by germinating seeds.

Answer 1

The correct option is D

Absorb carbon dioxide released by germinating seeds.

The correct option is D.

Explanation for the Correct Option:

• The potassium hydroxide solution is used in the experiment to demonstrate the release of carbon dioxide gas during respiration.
• The potassium hydroxide solution absorbs the carbon dioxide liberated by the seeds during respiration.
• It causes a rise in the solution level in the flask due to the formation of a vacuum.

Explanation for Incorrect Options:

Option A:

• The oxygen molecule is used during respiration that releases carbon dioxide. Hence, potassium hydroxide is not used to release oxygen.

Option B:

• The potassium hydroxide creates a vacuum in the flask after absorbing carbon dioxide. It does not remove water vapour from the flask.

Option C:

• The potassium hydroxide does not increase the respiration rate. It only interacts with the carbon dioxide released during respiration.

Therefore, the function of potassium hydroxide is to absorb the carbon dioxide gas liberated by the germinating seeds.