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NEET2005BotanyPhotosynthesis in Higher PlantsActual

Assertion : C₄ photosynthetic pathway is more efficient than the C ₃ pathway. Reason : Photorespiration is suppressed in C ₄ plants.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

A. If both assertion and reason are true and reason is the correct explanation of assertion

Step-by-step solution

C ₄ photosynthetic pathway is more efficient than C ₃ pathway as C ₄ plants can pick up CO ₂ even when it is found in low concentration. PEP enzymes shows high affinity for CO ₂ . C ₄ plants contain two types of chloroplast (Kranz anatomy) : bundle sheath chloroplast and mesophyll chloroplast. Bundle sheath cells contain Calvin cycle enzymes. Due to high concentration of CO ₂ in bundle sheath cells, RuBP carboxylase works only for Calvin cycle and not for photorespiration. Photorespiration is a wasteful process as

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