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NEETBotanyPhotosynthesis in Higher Plants

Where is the 3-carbon molecule transported after being released in the bundle sheath cells?

Options

  1. AEpidermal cells
  2. BStomata
  3. CMesophyll cells
  4. DGuard cells

Correct answer

C. Mesophyll cells

Step-by-step solution

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. It is important to register that the mesophyll cells lack RuBisCO enzyme. The C4 acid OAA is formed in the mesophyll cells. It then forms other 4-carbon compounds like malic acid or aspartic acid in the mesophyll cells itself, which are transported to the bundle sheath cells. In the bundle sheath cells these C4 acids are broken down

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