DENDROLOGY

Detailed explanation-1: -Carbon dioxide is released during photosynthesis.

Detailed explanation-2: -Plants, during the process of photosynthesis, take up carbon dioxide from the atmosphere and use sunlight along with it to make their food. The gas produced as a result of photosynthesis is oxygen.

Detailed explanation-3: -Sugars, made from water and carbon dioxide, are used to collect chemical energy. Water molecules split during photosynthesis to generate oxygen and hydrogen ions. As a result, plants expel oxygen, which is then used to reduce carbon dioxide and produce carbohydrates.