Accessory Pigments & Light Absorption — NEET Biology
📚 Practice ConceptThese graphs, together, show that most of the photosynthesis takes place in the blue and red regions of the spectrum; some photosynthesis does take place at the other wavelengths of the visible spectrum. Let us see how this happens. Though chlorophyll is the major pigment responsible for trapping light, other thylakoid pigments like chlorophyll b, xanthophylls and carotenoids, which are called accessory pigments, also absorb light and transfer the energy to chlorophyll a. Indeed, they not only enable a wider range of wavelength of incoming light to be utilised for photosynthesis but also protect chlorophyll a from photo-oxidation.
Which of the following statements about the requirements and associated components of photosynthesis are correct? S1: Chlorophyll 'a' is the chief pigment directly involved in trapping light energy for photosynthesis, while accessory pigments broaden the absorption spectrum. S2: Water serves as the electron donor in oxygenic photosynthesis and is the source of all oxygen released. S3: Carbon dioxide is fixed in the stroma to synthesize sugars, utilizing the energy from ATP and NADPH produced in the light reaction. S4: Mitochondria are indispensable cellular organelles where the light-dependent reactions of photosynthesis primarily occur. S5: Optimal light intensity for photosynthesis is always full sunlight, as higher intensities never lead to chlorophyll degradation.
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