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Biology
Posted 3 months ago

Q4.21. Which of the following statements about photosystems (C3,C4\left(\mathrm{C}_{3}, \mathrm{C}_{4}\right., and CAM) is true?
Only a minority of Earth's plants rely on the C3\mathrm{C}_{3} photosynthesis pathway.
CAM plants avoid photorespiration but have the cost of low water use efficiency.
Most C4\mathrm{C}_{4} and CAM plants are found at high latitudes, in cool climates.
For C4\mathrm{C}_{4} plants, the metabolic cost of avoiding photorespiration can be substantial.
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Answer from Sia
Posted 3 months ago
D
Key Concept
C4 Photosynthesis and Metabolic Cost
Explanation
C4 photosynthesis involves additional steps to concentrate CO2 before entering the Calvin cycle, which reduces photorespiration but increases energy expenditure.

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