LIFE SCIENCE

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 essential for the process of photosynthesis because oxygen is released in this process when plants utilize the raw materials i.e., carbon dioxide and water to produce sugars (glucose). Hence, it is not essential to carry out the process of photosynthesis.

Detailed explanation-3: -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-4: -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-5: -Oxygen (O2) is evolved during photosynthetic electron transport when water is split by the oxygen-evolving complex to provide protons and electrons to the chloroplastic electron chain, thereby generating ATP and NADPH-the energy source and reducing power for plant metabolism.