Which of the following promotes growth in plants?
Correct answer: B. Calvin cycle
- A. Photorespiration
- B. Calvin cycle
- C. Both of these
- D. None of these
Explanation
The Calvin cycle fixes carbon dioxide into organic compounds that can be used to form sugars and other substances needed for plant growth. Photorespiration consumes energy and reduces photosynthetic efficiency, so it does not promote growth. The likely mistake is choosing both because both processes occur in photosynthetic tissues, although their effects are opposite.
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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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