The percentages of light energy fixed in photosynthesis is generally around:
Correct answer: B. 1%
- A. 50%
- B. 1%
- C. 10%
- D. 75%
Explanation
The percentage of light energy fixed in photosynthesis is generally around 1%, which implies that the overall productivity of the biosphere is limited by this low rate of energy conversion. The low efficiency is due to several factors, including that most solar energy is at wavelengths unsuitable for photosynthesis (plants primarily use the red and blue light spectrum), and not all incoming light is absorbed by the leaves.
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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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