Question:

In C4 pathway, the CO2 fixation in mesophyll cells is carried out by the enzyme .........

Updated On: Apr 16, 2024
  • PEP carboxylase
  • Rubisco
  • Pyruvate dehydrogenase
  • Pyruvate decarboxylase
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The Correct Option is A

Solution and Explanation

In $C_{4}$ pathway, 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 $PEP$ case
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Concepts Used:

Photosynthesis in Higher Plants

Processes Of Photosynthesis in Higher Plants:

Photosynthesis in higher plants involves the following processes:

  • Light Reaction
  • Dark Reaction

Light Reaction:

  • This phenomenon occurs in the presence of light.
  • The pigment absorbs light and produces energy in the form of ATP.
  • The process involves- absorption of light, water splitting, the release of oxygen, and formation of ATP and NADPH.

Dark Reaction:

This process occurs in the absence of light in the stroma of the chloroplasts. The following cycles are involved in the process:

  1. Calvin Cycle (C3 Cycle)
  2. C4 Cycle (Hatch and Slack Pathway)