🧬 BiologyGraph

Photosynthesis Rate

Plot net photosynthesis against light intensity. Identify the compensation point, light saturation, and the effect of CO₂ as a limiting factor.

Max photosynthesis Pmax (low CO₂)

Max photosynthesis Pmax (high CO₂)

Half-saturation constant Ks

Dark respiration rate Rd

• Compensation point: light intensity at which photosynthesis = respiration (Pnet = 0)
• Light saturation point: beyond this, light is not limiting — CO₂ or Rubisco become limiting
• Dark respiration (Rd): y-intercept below zero — CO₂ released even in darkness
• Increasing CO₂ concentration raises Pmax — particularly visible at high light intensity
• CAM/C₄ plants have higher Pmax and lower compensation points than C₃ plants in hot, dry conditions

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