Question

How can you prove that CO2 is liberating in plants during respiration .​

Answer 1

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The rise in level water indicates that carbon dioxide is released as a result of germinating gram seeds during the process of respiration in the conical flask.

additional information

KOH solution absorbs the CO2 released during respiration of seeds, which creates a partial vacuum in the conical flask, causing the rise in the water level of the U-shaped delivery tube. Rise in the level of water shows that CO2 is released during respiration.

Answer 2

Objective:

To show that CO2 is liberated during aerobic respiration in plants .

Apparatus and materials required:

A conical flask, A beaker, A cork with a hole, A glass tube bent at the right angles at two points, A small test tube, KOH solution , thread coloured water

Procedure:

1. Take a conical flask and place some germinating gram seeds in it .
2. Insert the shorter end of the glass tube through the whole in the cork and fix it on the conical flask.
3. Before, fixing the cork ,hang a test tube containing KOH solution insert the coical flask with the help of a thread
4. Take coloured water in the beaker and keep longer end of the glass tube dipped inside it .
5. Make the conical flask air tight by applying vaseline on its rim
6. Note the initial level of water in the tube
7. Observe and note the rise of water level after an hour without disturbing apparatus

Observation:

Water rises up in the bent tube

Result:

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

[Hope this helps you.../]