Question:

The first carbon dioxide fixation product of C plants is

Updated On: Aug 15, 2022
  • oxaloacetic acid
  • ribulose biphosphate
  • phosphoenol pyruvate
  • phosphoglyceric acid
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The Correct Option is A

Solution and Explanation

In C plants, initial fixation of carbon dioxide occurs in mesophyll cells. The primary acceptor of CO i.e., phosphoenol pyruvate (PEP) combines with CO in the presence of PEP carboxylase or PEPcase to form oxaloacetic acid, which is the first stable carbon dioxide fixation product in C pathway.
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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)