Question

In the experiment to show that CO₂ is given out during respiration in plants,students use

• A. iodine solution
• B. KOH solution
• C. lime water
• D. alcohol

Answer 1

The correct option is B

KOH solution

The correct option is B.

Explanation of the correct option:

• Germinating seeds respire through the aerobic mode of respiration.
• In the experimental setup, potassium hydroxide is used to absorb the carbon dioxide produced during aerobic respiration.
• Potassium hydroxide is alkaline and readily combines with carbon dioxide, which is acidic, creating a vacuum inside the conical flask.

Explanation of the incorrect options:

Option A:

• Iodine solution is a disinfectant and is used to treat many bacterial infections. It cannot be used for demonstrating the carbon dioxide released during respiration.

Option B:

• The students use the potassium hydroxide (KOH) solution for the experiment of respiration in plants to absorb carbon dioxide.

Option C:

• Alcohol does not react with carbon dioxide to increase the water level in the flask.

Therefore, students use the KOH solution to demonstrate carbon dioxide released during respiration.