Question

Why should we cover the bell jar with a black cloth during the experiment?

Answer 1

1. We should cover the bell jar with a black cloth during the experiment in order to block the sunlight to pass through it which will stop the occurrence of photosynthesis.
2. So, the apparatus was covered so as to cut the supply of light to the plant.
3. In the presence of the sunlight, photosynthesis may occur which can use up the carbon dioxide formed in the experiment and convert it back to oxygen.