DENDROLOGY

Detailed explanation-1: -Photosynthesis is the process of synthesis of food by plants using carbon dioxide and water in presence of sunlight and chlorophyll. Oxygen (O2) is released during the process as a waste product. Hence, oxygen is not essential for the process of photosynthesis.

Detailed explanation-2: -Oxygen is not required for photosynthesis. Oxygen is liberated during photosynthesis. Photosynthesis is the process through which green plants manufacture food by converting solar energy into chemical energy.

Detailed explanation-3: -Oxygen is mainly released as a by-product by photolysis of water and released in the atmosphere. Thus, it is not required for photosynthesis.

Detailed explanation-4: -During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil. Within the plant cell, the water is oxidized, meaning it loses electrons, while the carbon dioxide is reduced, meaning it gains electrons. This transforms the water into oxygen and the carbon dioxide into glucose.