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Given below are two statements.
Statement I: The primary CO2 acceptor in C4 plants is phosphoenol pyruvate and is found in the mesophyll cells.
Statement II: Mesophyll cells of C4 plants lack the RuBisCO enzyme.
In the light of the above statements, choose the correct answer.

  • (a) Both Statement I and Statement II are true. Correct
  • (b) Both Statement I and Statement II are false. Your answer
  • (c) Statement I is true but Statement II is false. Your answer
  • (d) Statement I is false but Statement II is true. Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

Both statements are true. In C4 plants, PEP in the mesophyll cells is the primary CO2 acceptor (with PEP carboxylase), and NCERT states that the mesophyll cells lack RuBisCO; RuBisCO is in the bundle sheath cells.

Why the other options are wrong

  • (b) · your answer Both statements match NCERT, so both cannot be false.
  • (c) · your answer Statement II is also true: C4 mesophyll cells lack RuBisCO.
  • (d) · your answer Statement I is true: PEP is the primary acceptor, in the mesophyll.
NCERT point: C4: mesophyll has PEP carboxylase (no RuBisCO); bundle sheath has RuBisCO (no PEP carboxylase).
What is wrong?
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