How do C₃ and C₄ plants respond to CO₂ concentration?

How do C₃ and C₄ plants respond to CO₂ concentration?
  1. C₃ plants respond to higher CO₂ concentration while C₄ plants don't
  2. C₄ plants respond to higher CO₂ concentration while C₃ plants don't
  3. Both C₃ and C₄ plants respond to higher CO₂ concentration
  4. Neither C₃ nor C₄ plants respond to higher CO₂ concentration

Solution

At high light intensities, both C₃ and C₄ plants show an increase in the rates of photosynthesis, but C₄ plants show saturation at about 360 μlL⁻¹ while C₃ plants respond to increased CO₂ concentration and saturation is seen only beyond 450 μlL⁻¹.

Asked in: NCERT

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