When and why does aerobic respiration occur during cellular respiration in plants?

A :-) This only happens during the day, and at night the plant only undergoes respiration, not photosynthesis. Aerobic respiration happens when there is plenty of oxygen (normal level in air is 21%). Anaerobic respiration happens where there is less oxygen than this.

The principle of independent assortment describee how different genes independently separate from one another when reproductive cells develop.