DENDROLOGY

Detailed explanation-1: -Leaves. The exchange of oxygen and carbon dioxide in the leaf (as well as the loss of water vapor in transpiration) occurs through pores called stomata (singular = stoma).

Detailed explanation-2: -The small pores present on leaves help plants take in carbon dioxide and give out oxygen during the process of photosynthesis. These pores are called stomata.

Detailed explanation-3: -Stomata open to take in carbon dioxide, and during that process, oxygen gas is released out as waste. When the weather is sunny and hot, the stomata are more likely to open to let carbon dioxide in for more photosynthesis, while oxygen will also escape.