Why might the alternative pathways of photosynthesis using C₄ or CAM systems be described as metabolic compromises? a. Both pathways increase the rate of photosynthesis but also increase the rate of water loss. b. The CAM pathway allows more CO₂ into the plant but also increases the rate of water loss. c. The C₄ pathway decreases water loss but also increases the rate of photorespiration. d. Both pathways minimize photorespiration but also expend more ATP during carbon fixation.

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23-08-2022
Biology

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Why might the alternative pathways of photosynthesis using C₄ or CAM systems be described as metabolic compromises? a. Both pathways increase the rate of photosynthesis but also increase the rate of water loss. b. The CAM pathway allows more CO₂ into the plant but also increases the rate of water loss. c. The C₄ pathway decreases water loss but also increases the rate of photorespiration. d. Both pathways minimize photorespiration but also expend more ATP during carbon fixation.

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MubeenaD MubeenaD · Answer 1 · 2022-09-01T17:07:26+02:00

The alternative pathways of photosynthesis using C₄ or CAM systems might be described as metabolic compromises because (d) Both pathways minimize photorespiration but also expend more ATP during carbon fixation.

Photorespiration is an uneconomical process which takes place when the Calvin cycle enzyme rubisco reacts with oxygen instead of carbon dioxide.

This wasteful oxygenation reaction is observed in C₃ plants which lack any mechanism to deal with photorespiration.

However, C₄ plants tend to minimize photorespiration by carrying out initial fixation of CO₂ and the Calvin cycle in distinct types of cells.

Moreover, Crassulacean acid metabolism or CAM plants tend to minimize photorespiration and conserve water by segregating the above steps in time i.e. between night and day.

To learn more about photorespiration here

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