CBSE Class 10 Answered
1. Take some germinating seeds of moong dal in a conical flask.
2. Place a small test tube containing KOH solution in hanging position in the flask.
3. Fix a bent capillary tube with one end in conical flask and other end in the beaker containing colored water.
4. Air tight the conical flask with vaseline/pertoleum jelly so that the gas evolved during this process do not leak out.
4. Keep the set up for about two hours and observe change in water level in capillary tube.
Observation:
After 2 hours, the level of water has risen in the delivery tube at the end dipped in the beaker of water.
Result:
1. Rise in water level indicates that CO2 is produced by germinating seeds.
2. The germinating seeds respire and produce CO2 which is absorbed by KOH solution that created a vacuum in conical flask.
3. Air present in the bent glass tube moves into conical flask which pulls the water into the bent tube further.