NEET 2022 — Biology solution

NEET2022Biology

Given below are two statements :

Statement I : The primary CO $_{2}$ acceptor in C $_{4}$ plants is phosphoenolpyruvate and is found in the mesophyll cells

Statement II : Mesophyll cells of C $_{4}$ plants lack RuBisCo enzyme.

In the light of the above statements, choose the correct answer from the options given below :

A
Both Statement I and Statement II are correct
B
Both Statement I and Statement II are incorrect
C
Statement I is correct but Statement II is incorrect
D
Statement I is incorrect but Statement II is correct

Solution

In C $_{4}$ plants, the primary CO $_{2}$ acceptor is phosphoenolpyruvate (PEP), a 3-carbon compound, and the reaction is catalysed by PEP carboxylase in the mesophyll cells. Statement I is correct.

RuBisCO is absent from the mesophyll cells of C $_{4}$ plants; it is restricted to the bundle sheath cells, where the Calvin cycle operates. Statement II is correct.

This compartmentalisation is a key feature of the C $_{4}$ syndrome and underlies its photosynthetic efficiency.

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