Question

Tabulate any eight differences between C3 and C4 plants/ cycles.

Accepted Answer

Features C₃ Cycle C₄Cycle

Primary CO₂ accepter Primary CO₂ accepter in C₃cycle is RuBP. Primary CO₂ accepter in C₄ cycle is PEP.

Number of carbon in the primary CO2 accepter RuBP is a 5C compound. PEP is a three carbon compound.

Features C₃ Cycle C₄Cycle

First stable product Phosphoglyceric acid is the first stable product of C₃ cycle. First stable product of C₄ cycle is oxaloacetic acid.

Number of carbon in first product Phosphoglyceric acid is a three-carbon compound. Oxaloacetic acid.is a four-carbon compound.

Features C₃ Cycle C₄Cycle

Enzyme for carboxylation RuBisCO is responsible for carboxylation. Both PEP carboxylase and RuBisCO are taking part in carboxylation.

Photorespiration Photorespiration takes place in C₃plants in which RuBP fixes oxygen instead of CO₂. Hence, productivity is low in C₃ plants. Photorespiration is absent, hence, productivity is high in C₄ plants.

Features C₃ Cycle C₄Cycle

Location of RuBisCO RuBisCO is present in the mesophyll cells. RuBisCO is present only in bundle sheath cells.

Cells involved C₃ cycle takes place in mesophyll cells. Both mesophyll and bundle sheath cells are involved in C₄ cycle.

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