Even though plants cells photosynthesize, they still use their mitochondria for oxidation of pyruvate. this will occur in even though plants cells photosynthesize, they still use their mitochondria for oxidation of pyruvate. this will occur in photosynthetic cells in the light, while photosynthesis occurs concurrently cells that are storing glucose only nonphotosynthesizing cells only photosynthesizing cells in the light and in other tissues in the dark all cells all the time.

All cells all the time.

Explanation:

Photosynthesis is the process of the formation of organic nutrients, glucose in the presence of sunlight by fixing CO2. Cellular respiration is the oxidation of nutrients. The process forms ATP which in turn serve as energy currency for living cells.  

Plant cells perform cellular respiration to obtain the energy stored in the chemical bonds of glucose. The energy obtained by cellular respiration is used to perform the vital functions by cells. Therefore, irrespective of photosynthesis, cellular respiration occurs in all the cells of the plants all the time to fulfill the energy requirement for growth and development.

not sure if this what   you'r looking for would be percent composition