Photosynthetic Adaptations · NCERT Biology

CAM plants differ from C4 plants mainly in terms of:

  1. Type of chlorophyll used in each cell type
  2. Separation of steps in time rather than space
  3. Complete absence of Calvin cycle from leaves
  4. Higher rate of transpiration per unit leaf area
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Correct answer: Separation of steps in time rather than space

CAM plants separate CO2 fixation (at night) and the Calvin cycle (during the day) temporally within the same cells. In contrast, C4 plants achieve spatial separation by using distinct cell types (mesophyll and bundle sheath).

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