Question

Before arranging the experiment "Carbon dioxide evolved during the process of respiration"; the seeds must be ______

• A. Completely dried
• B. Boiled to soften them
• C. Soaked in vinegar
• D. Kept moist till germination

Answer 1

The correct option is D Kept moist till germination

Germinating seeds require water for growth. If moisture is not available, the seeds dry up, and rate of respiration would fall. Germinated gram seeds in a conical flask release carbon dioxide during respiration. The carbon dioxide released is absorbed by KOH present in the hanging test tube in the conical flask. This creates a vacuum in the conical flask which causes upward movement of water in the delivery tube leading to a change in the level of water in the delivery tube.

So, the correct answer is D.