The reactions of photosynthesis consist of:
Correct answer: A. Two phases
- A. Two phases
- B. Four phases
- C. Three phases
- D. Many phases
Explanation
The correct answer is Option A. Photosynthesis comprises two main phases: the light-dependent reactions and the Calvin cycle. During the light-dependent reactions, which take place in the thylakoid membranes, light energy is used to produce ATP and NADPH while splitting water molecules into oxygen and hydrogen ions. The Calvin cycle occurs in the stroma of chloroplasts and utilizes ATP and NADPH to fix carbon dioxide into glucose. Options B, C, and D are incorrect, as they suggest incorrect numbers of phases, deviating from the established two-phase process of photosynthesis.
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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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More Bioenergetics questions
Photosynthesis is a process in which:
The absorptive peaks in the absorption spectrum of chlorophyll b are at the wavelength of:
Pick up the one having the broadest valley:
In photosynthesis, reducing power and assimilatory power are synthesized during:
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The phase of photosynthesis in which sugar is synthesized by reducing CO₂ is also called the dark reaction because: