Question

The molecule which acts as a source for the production of oxygen gas by plants and algae is

• A. Water.
• B. Glucose.
• C. Carbon dioxide.
• D. Atmospheric oxygen.
• E. Atmospheric nitrogen.

Answer 1

The correct option is A Water.

Plants and algae carry out oxygenic photosynthesis and use light as the source of energy and carbon dioxide as the chief carbon source and water as an electron donor during photophosphorylation. Splitting of water in the presence of sunlight and transfer of its electrons to photosystem results in the production of oxygen. Hence, water molecule serves as the source of oxygen for these autotrophs.