do light require cellular respiration and photosynthesis ?

No, light does not require cellular respiration or photosynthesis. Light is a form of electromagnetic radiation and it's not a living organism that carries out metabolic processes like cellular respiration or photosynthesis.

Photosynthesis is the process in which plants, algae, and some bacteria convert light energy into chemical energy (glucose) with the help of chlorophyll and other pigments. This process involves capturing light energy to make food.

Cellular respiration, on the other hand, is how organisms (including plants and animals) break down glucose molecules to release energy in the form of ATP (adenosine triphosphate). It does not involve light directly but can use the products of photosynthesis as an energy source.

However, both these processes are interconnected in ecosystems since plants perform photosynthesis to create energy-rich compounds, which are then consumed by other organisms that undergo cellular respiration to derive energy.