Class NEET 2026 ALL Q #2003
KNOWLEDGE BASED
APPLY
4 Marks 2026 NTA-RE-NEET-2026 MCQ SINGLE
Which pigment has absorption peak at 700 nm in the photosynthetic reaction centre PS I (P700)?
(A) Carotenoids
(B) Chlorophyll b
(C) Chlorophyll a
(D) Xanthophylls
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Correct Answer: C

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Detailed Solution

Step 1: Identify the Reaction Center

In the process of photosynthesis, the light-harvesting complexes are organized into two photosystems: PS I and PS II. The reaction center of PS I is specifically designated as P700.

Step 2: Analyze the Pigment Composition

The reaction center of both photosystems consists of a specialized form of Chlorophyll a. While accessory pigments like carotenoids, xanthophylls, and Chlorophyll b help in harvesting light energy and transferring it to the reaction center, they do not act as the primary electron donor at the reaction center itself.

Step 3: Conclusion

The designation P700 refers to the specific absorption peak of the Chlorophyll a molecule located at the reaction center of Photosystem I. Therefore, the pigment is Chlorophyll a.

Final Answer: Chlorophyll a

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because the student must associate the specific nomenclature of the reaction center (P700) with the fundamental biological pigment (Chlorophyll a) learned in the context of photosynthesis.
Knowledge Dimension: FACTUAL
Justification: The question tests the recall of specific biological terminology and the structural components of the photosynthetic apparatus defined in the NCERT curriculum.
Syllabus Audit: In the context of NEET, this is classified as KNOWLEDGE (Textbook). This question directly assesses the student's grasp of the 'Photosynthesis in Higher Plants' chapter, which is a high-yield topic for NEET.
||KEY:C

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