DENDROLOGY

Detailed explanation-1: -Oxygen is a byproduct of photosynthesis and, correspondingly, carbon dioxide the byproduct of respiration.

Detailed explanation-2: -In photosynthesis, solar energy is harvested and converted to chemical energy in the form of glucose using water and carbon dioxide. Oxygen is released as a byproduct.

Detailed explanation-3: -The food formed by the process of photosynthesis is glucose. CO2 which is taken by the plants is released by humans as the by-product of respiration and O2 released by plants is taken by humans for respiration. O2 is the by-product of photosynthesis.

Detailed explanation-4: -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. The plant then releases the oxygen back into the air, and stores energy within the glucose molecules.