What is the purpose of plants having mitochondria if they have chloroplasts?

Plant cells need both chloroplasts and mitochondria because they perform both photosynthesis and cell respiration.

Explanation:

Chloroplast converts solar energy into chemical energy during photosynthesis, while mitochondria, the powerhouse of the cell, produces ATP- the energy currency of the cell during respiration.

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.