RE-NEET 2026 Botany Pigments MCQ Question
Which pigment has absorption peak at 700 nm in the photosynthetic reaction centre PS I (P₇₀₀) ?
Chlorophyll a
Xanthophylls
Carotenoids
Chlorophyll b
Correct Answer
Detailed Explanation
The correct answer is A) Chlorophyll a, which has an absorption peak at 700 nm, specifically in the photosystem I (PS I) reaction center. Chlorophyll a is essential for capturing light energy during photosynthesis.
In contrast, xanthophylls and carotenoids primarily absorb light in the blue and green wavelengths, while chlorophyll b absorbs light around 640-660 nm. Thus, they do not have the absorption peak at 700 nm, making them incorrect options.
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