Question

describe an experiment to prove that carbon dioxide is essential for the process of photosynthesis

Answer 1

Hi friend, Here is the required answer:-

Hope this helps you...

Answer 2

Lime water absorbs carbon dioxide and hence there is no carbon dioxide for the leaf and hence photosynthesis does not take place and no starch is prepared. Hence on iodine test, the presence of starch is negative and thus proves that carbon dioxide is required for photosynthesis.

We can put half of the leaf inside the flask and half of it outside. So, the inside part will not show presence of starch and the outside part will show presence of starch.