NEET 2023 Phase 1 · BiologyPrevious Year Question
The reaction centre in PS II has an absorption maxima at
Answer: (A) 680 nm. Each photosystem has a single reaction-centre chlorophyll a.
- A.680 nm✓
- B.700 nm
- C.660 nm
- D.780 nm
Correct Answer
(A) 680 nm
Solution & Explanation
Each photosystem has a single reaction-centre chlorophyll a. In PS I this has an absorption peak at 700 nm (P700), while in PS II the reaction centre absorbs maximally at 680 nm and is called P680. Therefore the PS II reaction centre has an absorption maximum at 680 nm. NCERT: Class 11 Ch 11, p.138 [138:034-036]: "while in PS II it has absorption maxima at 680 nm, and is called P680"
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