Question:

In $C_{4}$ plants, photorespiration does not occur. $C_{4}$ plants have a mechanism that increases the concentration of $CO_{2}$ at the enzyme site.

Updated On: Jul 6, 2022
  • If both assertion and reason are true and reason is the correct explanation of assertion
  • If both assertion and reason are true but reason is not the correct explanation of assertion
  • If assertion is true but reason is false
  • If both assertion and reason are false
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The Correct Option is A

Solution and Explanation

In $C_{4}$ plants photorespiration does not occur because they have a mechanism that increases the concentration of $CO_{2}$ at the enzyme site. This takes place when the $C_{4}$ acid from the mesophyll is broken down in the bundle sheath cells to release $CO_{2}$. This results in increasing the intracellular concentration of $CO_{2}$. This ensures that the $RuBisCO$ functions as a carboxylase, thus, minimising the oxygenase activity.
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Notes on Photosynthesis in higher plants

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)