Question
Download Solution PDFGiven 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:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept: Plants that are adapted to dry tropical regions have the C4 pathway. C4 plants 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.
Last updated on Jun 16, 2025
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