KCET · BIOLOGY · STD 11 - 11. Photosynthesis in Higher Plants
In the maize plant, \(CO _2\), fixation occurs in both mesophyll and bundle sheath cells. The enzymes involved in these cells for the process respectively are
- A RuBisCO and PEP kinase
- B PEP kinase and Pepsin
- C RuBisCO and PEP carboxylase
- D PEP carboxylase and RuBisCO
Answer & Solution
Correct Answer
(D) PEP carboxylase and RuBisCO
Step-by-step Solution
Detailed explanation
(D) PEP carboxylase and RuBisCO,
Maize plant is a \(C _4\) plant. The primary \(CO _2\) 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. It is important to register that the mesophyll cells lack RuBisCO enzyme. The \(C _4\) acid OAA is formed in the mesophyll cells.
The \(CO _2\) is then fixed by RuBisCO and made into sugar via the Calvin cycle.
Maize plant is a \(C _4\) plant. The primary \(CO _2\) 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. It is important to register that the mesophyll cells lack RuBisCO enzyme. The \(C _4\) acid OAA is formed in the mesophyll cells.
The \(CO _2\) is then fixed by RuBisCO and made into sugar via the Calvin cycle.
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