Table : table 10.1 Comparison of Photosynthesis in C₃, C₄, and CAM Plants

	C₃ plants	C₄ plants	CAM plants
Calvin cycle used?	Yes	Yes	Yes
Primary CO₂ acceptor	RuBP	PEP	PEP
Primary CO₂-fixing enzyme	Rubisco	PEP carboxylase	PEP carboxylase
First product of CO₂ fixation	3PG (3-carbon)	Oxaloacetate (4-carbon)	Oxaloacetate (4-carbon)
Affinity of primary fixing enzyme for CO₂	Moderate	High	High
Photosynthetic cells of leaf	Mesophyll	Mesophyll and bundle sheath	Mesophyll with large vacuoles
Photorespiration	Extensive	Minimal	Minimal