Question

Why is KOH solution kept in the test-tube inside the airtight conical flask while doing the experiment of respiration of seeds ?

CBSE Class X Science SA 1 ( 2 marks)

Answer 1

KOH solution kept in the test-tube inside the air-tight conical flask absorbs the evolved carbon dioxide released by germinating seeds; thereby creating a partial vacuum in the conical flask. So, an equal volume of water rises up in the tube. This indicates that the germinating seeds are actively respiring and CO2 gas is evolving in the process of germination.

Answer 2

KOH solution kept in the test-tube inside the air-tight conical flask absorbs the evolved carbon dioxide released by germinating seeds; thereby creating a partial vacuum in the conical flask. So, an equal volume of water rises up in the tube. This indicates that the germinating seeds are actively respiring and CO2 gas is evolving in the process of germination.