What provides energy in a plant cell?

Plant cells produce energy through the chemical processes of photosynthesis and cellular respiration.

Photosynthesis:

Plants contain specialized organelles in their cells called chloroplasts. Chloroplasts contain chlorophyll molecules. Chlorophyll molecules are able to absorb energy from sunlight. Plant cells use this absorbed energy to convert carbon dioxide and water to glucose and oxygen. The glucose produced in this reaction is then used during the chemical process of cellular respiration. 

light energy ->

Cellular Respiration:

Plants also contain specialized organelles in the their cells called mitochondria.

In the mitochondria, glucose and oxygen react to create carbon dioxide, water, and energy in the form of adenosine triphosphate (ATP). When ATP molecules are broken down in the plant cell, they release energy for the plant to use.

(energy)

Therefore, the plant cell is able to convert light energy into chemical energy which it can then use to power its cellular processes.