Chlorophyll-a molecules act as antenna molecules. They get excited by absorbing light and emit electrons during cyclic and non-cyclic photophosphorylations. They form the reaction centres for both photosystems I and II. Chlorophyll-b and other photosynthetic pigments such as carotenoids and xanthophylls act as accessory pigments. Their role is to absorb energy and transfer it to chlorophyll-a. Carotenoids and xanthophylls also protect the chlorophyll molecule from photo-oxidation. Therefore, chlorophyll-a is essential for photosynthesis.
If any plant were to lack chlorophyll-a and contain a high concentration of chlorophyll-b, then this plant would not undergo photosynthesis.
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This question is important because it tests key concepts from the NCERT syllabus and is frequently asked in CBSE exams.
This question is based on core NCERT concepts explained in the chapter and should be revised thoroughly before exams.
Chlorophyll-a molecules act as antenna molecules. They get excited by absorbing light and emit electrons during cyclic and non-cyclic photophosphorylations. They form the reaction centres for both photosystems I and II. ...
Step-by-step explanation:
• Chlorophyll-a molecules act as antenna molecules
• They get excited by absorbing light and emit electrons during cyclic and non-cyclic photophosphorylations
• They form the reaction centres for both photosystems I and II
• Chlorophyll-b and other photosynthetic pigments such as carotenoids and xanthophylls act as accessory pigments
• Their role is to absorb energy and transfer it to chlorophyll-a
Students often lose marks by skipping steps, writing incomplete explanations, or misunderstanding keywords used in the question.
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