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Question

Select the wrongly matched pair with regard to C4 - cycle.

A
Primary CO2 fixation-PGA product
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B
Site of initial carboxylation-Mesophyll cells
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C
Primary CO2 acceptor- PEP
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D
C4-plant-Maize
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E
Location of enzyme RuBisCO-Bundle sheath cells
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Solution

The correct option is A Primary CO2 fixation-PGA product
C4 pathway is observed in C4 plants like Maize. The primary CO2 fixation product in C4 cycle is oxaloacetic Acid (OAA) which is formed by the fixation of CO2 in phosphoenol pyruvate in the mesophyll cells.
OAA then forms other 4C compounds like malic acid or aspartic acid in the mesophyll cells and transported to the bundle sheath cells.
In the bundle sheath cells, CO2 in the 4C compounds is made use by the enzyme RUBISCO to generate chemical energy in the form of sugars.
PGA is the primary CO2 fixation product of C3 cycle.

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