Question

Assertion (A): A plant should be placed in dark for 24 to 48 hours before using it for experiments on photosynthesis.

Reason (R): During this period, all the starch from the leaves, is either utilized in the process of respiration or stored in the storage organs.

Options

• A is True and R is False.

• A is False and R is True.

• Both A and R are True.

• Both A and R are False.

Answer 1

Both A and R are True.

Explanation:

Keeping a plant in darkness for 24-48 hours destarches its leaves, so any starch detected afterward can be attributed to photosynthesis during the experiment. The existing leaf starch is used in respiration or transported and stored in other organs. Hence, both A and R are true.