Question:

Photosynthesis in C₄ plants is relatively less limited by atmospheric CO₂ levels because :

Updated On: Jul 11, 2024

four carbon acids are the primary initial CO₂ fixation products
the primary fixation of CO₂ is mediated via PEP carboxylase
effective pumping of CO₂ into bundle sheath cells
RUBISCO in C₄ plants has higher affinity for CO₂

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The Correct Option is B

Solution and Explanation

Plants like sugarcane and sorghum employ a unique mechanism wherein they convert atmospheric carbon dioxide into oxaloacetic acid, a C₄ compound, through the action of phosphoenol pyruvate carboxylase (PEP carboxylase). These plants are categorized as C₄ plants. In C₄ plants, the primary formation of oxaloacetic acid (OAA) is facilitated by PEP carboxylase, making them less susceptible to limitations imposed by atmospheric CO₂ levels.

So, the correct option is (B): The primary fixation of CO₂ is mediated via PEP carboxylase

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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:

Calvin Cycle (C3 Cycle)
C4 Cycle (Hatch and Slack Pathway)

Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because :