Question

What is the source of oxygen for respiration in plants during the daytime?

Answer 1

Hint: Respiration is the process in which organisms exchange gases between their body cells and the environment. The process of respiration in plants involves the use of the sugars produced during photosynthesis plus oxygen to produce energy for plant growth. In many ways, respiration is the opposite of photosynthesis.

Complete answer:
Plants like other animals also respire. Plants also need energy. The plants get energy through the method of respiration during which glucose food breaks down within the presence of oxygen to make $CO_{2}$ and water with the discharge of energy. This energy is employed by the plant for completing its various life processes. Thus, like other organisms, plants also respire for survival. In other words, in plants, each part can independently absorb oxygen from the air, utilize it to get energy and release out $CO_{2}$.
Respiration in plants happens throughout the day and night thereby carbon dioxide is produced. However, during the daytime, the amount of carbon dioxide released is negligible compared to the amount of oxygen produced as a result of photosynthesis. Hence, one shouldn't sleep under a tree at night time.

Note: -$C_{6}+H_{12}O_{6}+6O_{2}\rightarrow 6CO_{2}+6H_{2}O+ATP$ is the complete balanced chemical formula for cellular respiration.
-There are three types of respiration, they include internal, external, and cellular respiration.
-External respiration is the breathing process. It involves inhalation and exhalation of gases.
-Internal respiration involves a gas exchange between the blood and body cells.
-Cellular respiration involves the conversion of food to energy. Aerobic respiration is cellular respiration that requires oxygen while anaerobic respiration does not.