Question:

The first carbon dioxide acceptor in C4-plants is

Updated On: Aug 13, 2024
  • PEP (Phosphoenol pyruvate)
  • RuBP (Ribulose biphosphate)
  • Oxaloacetic acid
  • 3-PGA (3-Phosphoglyceric acid)
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The Correct Option is A

Solution and Explanation

The primary acceptor of CO2, is a 3 carbon compound phosphoenol pyruvic acid. Addition of CO2, to any compound is called carboxylation. In C4 cycle, CO2, combines with phosphoenol pyruvic acid to form oxaloacetic acid. The enzyme is phosphoenol pyruvate carboxylase (PEPCo). The oxaloacetic acid breaks up into pyruvic acid and CO2, which combines with RUDP to form PGA as in Calvin cycle.
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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)