Which of the following is a compensation point:
Correct answer: B. Photosynthesis and respiration occur at same rate. So there is not net exchange of gases between atmosphere and plants.
- A. Leaves respire and utilize O2 and release CO2.
- B. Photosynthesis and respiration occur at same rate. So there is not net exchange of gases between atmosphere and plants.
- C. Rate of photosynthesis increases, so do the O2 production, with a net release of oxygen coupled with the uptake of CO2.
- D. Rate of respiration becomes more than rate of photosynthesis.
Explanation
The compensation point occurs when photosynthesis and respiration proceed at equal rates, so the oxygen taken up and released, and the carbon dioxide released and fixed, balance each other. Students may choose option d by considering only respiration, but that describes a point where the plant has a net release of carbon dioxide.
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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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