Question
Which pigment has absorption peak at 700 nm in the photosynthetic reaction centre PS I (P700) ?
NEET
Botany
Photosynthesis in Higher Plants
2026
NEET 2026 (Re-NEET)
NEET Botany Question (2026) — Solution
Options
- A. Carotenoids
- B. Chlorophyll b
- C. Chlorophyll a
- D. Xanthophylls
Answer
C. Chlorophyll a
Step-by-step solution
In the light reaction of photosynthesis, the reaction centre of Photosystem I (PS I) consists of a specific molecule of chlorophyll a. This chlorophyll a molecule has an absorption peak at 700 nm, which is why it is designated as P700. In contrast, the reaction centre of Photosystem II (PS II) is a chlorophyll a molecule with an absorption peak at 680 nm, known as P680. Answer: Chlorophyll a
Related: Botany — Photosynthesis in Higher Plants · All PYQ Banks