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Based on photosynthesis,C4 plants are more efficient than C3 plants due to following causes:-

  • Photorespiration is absent or rare in C4 plants.
  • PEP and PEPC have more affinity with CO2 than oxygen.
  • C4 plants have low compensation points of CO2 for photosynthesis.
  • There are two sites of photosynthesis with two types of chloroplasts.
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