At which wavelength of light is photosynthesis maximum?
Correct answer: A. Red light
- A. Red light
- B. Blue light
- C. Green light
- D. Far-red light
Explanation
Blue light around 450 nanometers helps plants grow strong leaves and stems, playing a good role in photosynthesis but not reaching its highest level. Green light near 550 nanometers is mostly reflected, which is why plants look green, and it contributes the least to photosynthesis. Red light around 680 nanometers, however, is the most effective for photosynthesis, as it is absorbed best by chlorophyll and powers the light reactions that give plants their energy. Far-red light near 750 nanometers supports some growth functions but has a weaker effect on photosynthesis compared to red light.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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