Given below are two statements :

Statement I:

The primary CO2 acceptor in C4 plants is phosphoenolpyruvate and is found in the mesophyll cells.

Statement II:

Mesophyll cells of C4 plants lack RuBisCo enzyme.

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

  1. Statement I is incorrect but Statement II is correct
  2. Both Statement I and Statement II are correct
  3. Both Statement I and Statement II are incorrect
  4. Statement I is correct but Statement II is incorrect

Answer (Detailed Solution Below)

Option 2 : Both Statement I and Statement II are correct
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CT 1: Botany (Cell:The Unit of Life)
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Detailed Solution

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ConceptPlants that are adapted to dry tropical regions have the C4 pathway.  Cplants have a special type of leaf anatomy, they tolerate higher temperatures, they show a response to high light intensities, they lack a process called photorespiration, and have greater productivity of biomass. 

Explanation:  Plants in tropical desert regions commonly follow the C4 pathway. Here, a 4-carbon compound called oxaloacetic acid (OAA) is the first product of carbon fixation. Such plants have certain adaptations as well.

Statement I:  The primary CO2 acceptor is a 3-carbon molecule, phosphoenol pyruvate (PEP), and is present in the mesophyll cells. The enzyme responsible for this fixation is PEP carboxylase or PEPcase. This statement is correct.

Statement II:  Mesophyll cells of C4 plants lack the RuBisCO enzyme.  The C4 acid OAA is formed in the mesophyll cells. This statement is correct. 

So, option 2 is correct.

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