Question

In non-cyclic photophosphorylation, the pigment molecule first excited is known as

• A. $P_{680}$
• B. $P_{700}$
• C. Chlorophyll- b
• D. Xanthophyll

Answer 1

Answer: (A)

$P_{680}$

Green plants and algae use two types of photosystems, PS-I with chlorophyll $P_{700}$ in its reaction center and PS-II with $P_{680}$ in its reaction center. The two photosystems are linked by a chain of electron carrires. Light excites $P_{680}$ of PS-II to activate $P_{680}$.