AP BIOLOGY

Detailed explanation-1: -Thus, water (H2O) is the source of oxygen released during photosynthesis.

Detailed explanation-2: -Photosynthesis produces water as a byproduct. During photosynthesis, plants take carbon dioxide ( C O 2 ), and water ( H 2 O ) from the air and soil. In the plant cell, carbon dioxide is reduced, which results in the gain of electrons, whereas water is oxidized, which results in the loss of electrons.

Detailed explanation-3: -Oxygen is released due to the photolysis of water. Sunlight helps in splitting up of the water molecules thereby releasing oxygen.

Detailed explanation-4: -Water is not produced in photosynthesis. Instead water is absorbed by the root system and used for photosynthesis by combining carbon dioxide, water, and sunlight to create sugar and oxygen.

Detailed explanation-5: -During oxygenic photosynthesis, light energy transfers electrons from water (H2O) taken up by plant roots to CO2 to produce carbohydrates. In this transfer, the CO2 is “reduced, ” or receives electrons, and the water is “oxidized, ” or loses electrons. Oxygen is produced along with carbohydrates.