Question

Assertion (A): The oxygen released during photosynthesis comes from the carbon dioxide molecule.

Reason (R): Oxygen is a byproduct of the reduction of carbon dioxide during photosynthesis.

Options

• Both A and R are true and R is the correct explanation of A.

• Both A and R are true but R is not the correct explanation of A.

• A is true but R is false.

• A is false but R is true.

Answer 1

A is false but R is true.

Explanation:

During photosynthesis, the oxygen released comes from the splitting of water (H₂O) and not from carbon dioxide. Therefore, the assertion is false. Carbon dioxide is reduced to form carbohydrates, and oxygen is released as a by-product during the overall photosynthetic process. Hence, the reason is true, but it does not state the source of the released oxygen.