Question

plants also perform cellular respiration. why do plants need this process even though they can make food through photosynthesis?

Explanation:

Photosynthesis makes glucose, but plants need energy in the form of ATP. Cellular respiration breaks down glucose to produce ATP for plant - cell functions like growth, repair, and active transport.

Answer:

Plants need cellular respiration to convert the glucose made during photosynthesis into ATP, which is the energy - currency for the cell's various metabolic activities such as growth, maintenance, and transport of substances across cell membranes.