Question

Pigment acting as a reaction centre during photosynthesis is

• A. Carotene
• B. Phytochrome
• C. Chlorophyll a of $P_{700}$
• D. Cytochome.

Answer 1

Answer: (C)

Chlorophyll a of $P_{700}$

The single chlorophyll a forms reaction centre and is different for both photosystems. In PS I the reaction centre has an absorption peak at 700 nm, hence is called $P_{700}$ and for PS II it is 680 nm and is called as $P_{680}$.

So the correct option is 'Chlorophyll a of $P_{700}$'.