Question

The following materials required for the experiment to show that CO₂ is produced during respiration by use of KOH was collected, but one material is short. Tick the material which is short

Materials collected. (1) Germinating gram seeds, (2) Conical flask, (3) Small test tube, (4) Thread, (5) One-holed cork, (6) Bent glass tube, (7) Beaker, (8) Water.

• A. Thread
• B. Conical flask
• C. KOH solution
• D. Germinating seeds.

Answer 1

The correct option is C

KOH solution

The correct option is (C)

Explanation for the correct option:

1. The germinating seeds in the flask produce CO₂ (carbon dioxide).
2. KOH (potassium hydroxide) is a chemical compound that absorbs CO_2.
3. Thus, the use of KOH is not required to test the presence of CO_2.

Explanation for incorrect options:

Option (A)

1. Thread is required to hang the pallets during the experiment.
2. Thus, a thread is present in the collected materials.

Option (B)

1. The germinating seeds are placed in a conical flash with a closed opening.
2. Thus, a conical flask is present in the collected materials.

Option (D)

1. Germinating seeds are the source of carbon dioxide in the experiment.
2. Thus, germinating seeds are present in the collected materials.

KOH is not required to detect the presence of carbon dioxide.