# What is the role of chlorophylls in the biochemical pathways of photosynthesis?

Apr 11, 2018

Chlorophyll entraps sunlight that is necessary for carrying out various biochemical reactions taking place during photosynthesis.

#### Explanation:

Photosynthesis is defined as the photo-chemical process in which carbohydrates are synthesized from raw materials like carbon dioxide and water. It occurs in 2 steps: light reaction and dark reaction.

Light reaction requires light . Energy of photons in sunlight is used for the photolysis or breakdown of $H 2 O$, resulting in the production of ATPs and $N A D P H 2$ , the reducing power.

Dark reaction does not require light. It simply involves reduction of $C O 2$ to glucose ( $C 6 H 12 O 6$), occuring in a series of steps controlled by various enzymes. It can not occur in absence of light as it is dependent upon the end products of light reaction, i.e. ATP and $N A D P H 2$ , though not requiring light directly.

We have seen that the entire process of photosynthesis, occurring in a series of steps, can not occur in absence of light. Chlorophyll pigment thus has crucial role of entrapping sunlight that is absolutely necessary for the process of photosynthesis.