Standard graphs reveal photosynthesis limiting factors

Steps:

• Photosynthesis rate vs. CO2 concentration rises hyperbolically to a plateau as CO2 becomes non-limiting.
• Rate vs. temperature rises to an optimum (around 25-35°C for most plants) then falls due to enzyme denaturation, forming a bell curve.
• Rate vs. light intensity mirrors CO2, showing a hyperbolic increase to saturation without decline.
• Graphs 1 and 2 likely show hyperbolic (CO2) and bell-shaped (temperature) curves, distinguishing these factors.

Why B is correct:

• CO2 follows Michaelis-Menten kinetics for enzyme saturation, while temperature affects enzyme activity per Arrhenius equation, producing unique curve shapes.

Why the others are wrong:

• A: Light and CO2 both yield similar hyperbolic curves, lacking distinction.
• C: Reverses order; graph 1 matches CO2 rise, not temperature peak.
• D: Light hyperbolic curve doesn't decline like temperature's bell shape.

Final answer: B