# What is a photosystem?

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Dec 26, 2017

A photosystem is a complex in which photosynthetic pigments are arranged in the form of clusters for the efficient absorption and utilization of sunlight energy in thylakoid membranes.

#### Explanation:

Photosystem constitutes two main parts. A brief concept to them is as follows:

• Antenna Complex:
It is a light- harvesting complex containing proteins and many molecules of $\text{cholorophyll a}$, $\text{cholorophyll b}$ and $\text{carotenoids}$. Photons of light are first absorbed by antenna complex pigments which then transfer the energy to the reaction center.
• Reaction Center:
It has one or more molecules of $\text{cholorophyll a}$ along with primary electron acceptor and associated electron carriers of electron transport system.
It receives the absorbed sunlight energy from the antenna complex and convert that energy into $\text{chemical energy}$.

$N o t e :$

In plants and photosynthetic green algae $\to$ photosystem are present in thylakoid membranes of choloroplast.

In photosynthetic bacteria $\to$ photosystem are present in plasma membranes.

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