Q11 / 180 · NEET 2026 (Re-NEET) · Botany
Which pigment has absorption peak at $700$ nm in the photosynthetic reaction centre PS I (P700) ?
- ACarotenoids
- BChlorophyll b
- Correct answerCChlorophyll a
- DXanthophylls
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
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
Hence, the correct answer is option: 'C'.