Question

Why the conical flask must be made airtight while demonstrating that co2co2 is evolved during aerobic respiration?

Answer 1

Explanation:

1st from right mean - 40th from left - 0 i.e 40th from left

2nd from right mean - 40th from left - 1 i.e. 39th from left

3rd from right mean - 40th from left - 2 i.e. 38th from left

Similarly, 14th from right mean - 40th from left - 13 i.e. 27th from left

Answer 2

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The rise in the level of water indicates that CO2 is produced by germinating seeds during respiration. Actually, the germinating seeds respire and produce CO2, which is absorbed by KOH solution. This creates a vacuum in the conical flask. The air present in the bent glass tube moves into the conical flask. This pulls the water in the bent tube further up.