GraphIt
.now
/
Subjects
Tutorial
About
Contact
/
Biology
/
Photosynthesis Rate
/
Advanced Editor
🧬 Biology
← Standard view
Scale Graph to Fit Data
Copy
PNG ↓
Labels
Graph title
X-axis label
Y-axis label
Axis Bounds
X-Axis
to
Y-Axis
to
Apply
Parameters
Max photosynthesis Pmax (low CO₂)
Max photosynthesis Pmax (high CO₂)
Half-saturation constant Ks
Dark respiration rate Rd
Key Concepts
•
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
Legend
Show Legend
Yes
No
Size
10