Question

Give an experiment to prove that carbon dioxide is required for photosynthesis

Answer 1

Answer:

Aim: To show that carbon dioxide is necessary for photosynthesis

Procedure:

   Take a plant with destarched leaves.

   Insert one of its leaves in a conical flask containing potassium hydroxide.

   Leave the plant in sunlight.

   After a few hours, test the particular leaf and some other leaf of the same plant for the presence of starch.

Observation: The leaf which was inserted in the conical flask stains brown, and the other leaf which is exposed to sunlight turns blue-black.

Inference: 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.