Question

In PS I, the reaction centre chlorophyll a has an absorption peak at

• A. 650 nm
• B. 660 nm
• C. 680 nm
• D. 700 nm

Answer 1

Answer: (D)

700 nm

Photosystems are the protein complexes involved in photosynthesis. Each photosystem is characterized by the wavelength of light to which its reaction centre is most reactive. Photosystem I, reaction centre pigment chlorophyll a has absorption peak at 700nm. Thus photosystem I is also known as P${}_{700}$

So, the correct answer is '700 nm'