Question

A student conducted an experiment to show CO2 is released during respiration. List two precautions that he/she must take for obtaining correct observations

Answer 1

A student conducted an experiment to show CO₂ is released during respiration.
For obtaining correct observations, following precautions should be kept in mind:

1. Always use freshly prepared KOH solution and as KOH is corrosive so handle it carefully.
2. The experiment set up must be air-tight.

Hopefully it helps. Thanks.

Answer 2

Carbon dioxide is released during respiration by plants.This can be proved by an experiment by taking germinating seeds in a plant in a flask.
KOH solution is kept inside the flask with the help of a thread.In another beaker coloured water is kept.The rise in the level of the water is observed.
For the experiment, the following precautions must be taken.

Precautions:

1. Keep the conical flask airtight.

2. Fix the shorter end of the glass tube in such a way that it does not touch the seeds.

3. Use freshly prepared KOH solution.

Hope this helps