Explain the structure of reaction centre.

1.	Explain the structure of reaction centre.
Answer» Solar energy is trapped by chlorophyll and stored in the form of chemical energy as ATP and in the form of reducing power as NADPH₂ . Oxygen is evolved in the light reaction by splitting of water. The components of light reaction are as follows: Reaction centre: 1. The light absorbing pigments present in thylakoid membranes are arranged in clusters of chlorophyll and accessory pigments. 2. P-680 and P-700 are the special type of chlorophyll molecules which form the reaction centres or photocentres. 3. Solar energy is harvested by accessory pigments and other chlorophyll molecule and is passed on to the reaction centre. 4. These (accessory pigments) are known as light harvesting or antenna molecule. Their function is to absorb light energy and transmit at a very high rate to the reaction centre where the photochemical reactions occur.

Answer»

Solar energy is trapped by chlorophyll and stored in the form of chemical energy as ATP and in the form of reducing power as NADPH₂ . Oxygen is evolved in the light reaction by splitting of water. The components of light reaction are as follows:

Reaction centre:

1. The light absorbing pigments present in thylakoid membranes are arranged in clusters of chlorophyll and accessory pigments.

2. P-680 and P-700 are the special type of chlorophyll molecules which form the reaction centres or photocentres.

3. Solar energy is harvested by accessory pigments and other chlorophyll molecule and is passed on to the reaction centre.

4. These (accessory pigments) are known as light harvesting or antenna molecule. Their function is to absorb light energy and transmit at a very high rate to the reaction centre where the photochemical reactions occur.

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