AP BIOLOGY

Detailed explanation-1: -Plants do not need oxygen for photosynthesis. Instead, oxygen is produced during photosynthesis.

Detailed explanation-2: -So the correct option is photosynthesis.

Detailed explanation-3: -Sunlight provides energy to the plant while water and carbon dioxide provide all the important nutrients required by the plant for food preparation. Oil is not required by the plant in food prepration.

Detailed explanation-4: -Plants are active photosynthesisers i.e., they take up carbon dioxide from the atmosphere and using the energy from sunlight and water they convert it into carbohydrate molecules. During this process, plants produce oxygen. They utilise the oxygen produced for respiration.

Detailed explanation-5: -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.