Light Factors & Photosynthesis Rate — NEET Biology
📚 Practice ConceptWe need to distinguish between light quality, light intensity and the duration of exposure to light, while discussing light as a factor that affects photosynthesis. There is a linear relationship between incident light and CO₂ fixation rates at low light intensities. At higher light intensities, gradually the rate does not show further increase as other factors become limiting. What is interesting to note is that light saturation occurs at 10 per cent of the full sunlight. Hence, except for plants in shade or in dense forests, light is rarely a limiting factor in nature. Increase in
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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