Question

Experiment to show that CO2 is necessary for photosynthesis

Answer 1

Answer:

Potassium hydroxide in the flask absorbs carbon dioxide; thus, due to the absence of CO2, the leaf fails to produce starch which proves that carbon dioxide is necessary for photosynthesis.

Explanation:

Answer 2

Photosynthesis did not go on because there was no carbon dioxide in flask A. The carbon dioxide was absorbed by the sodium hydroxide. In flask B, the colour of the iodine solution turned blue black. This is because starch was present in the leaf of flask B. Starch was present because it underwent photosynthesis.