Question:
In C4 plants, Calvin cycle operates in
In C4 plants, Calvin cycle operates in
Updated On: Jun 23, 2024
- stroma of bundle sheath chloroplasts
- grana of bundle sheath chloroplasts
- grana of mesophyll chloroplasts
- stroma of mesophyll chloroplasts.
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The Correct Option is A
Solution and Explanation
The C4 plants have a characteristic leaf anatomy called kranz anatomy. Here two types of chloroplasts are present - bundle sheath chloroplasts and mesophyll chloroplasts. In C4 plants, there are two carboxylation reactions which occur first in mesophyll chloroplasts and then in bundle sheath chloroplasts. CO2 acceptor molecule in mesophyll chloroplasts is PEP (Phospho-enol pyruvate) and not Ribulose 1, 5-biphosphate. Further it has enzyme PEP-carboxylase. 1 RUBP-carboxylase is absent in mesophyll chloroplasts but is present in bundle sheath chloroplasts. The first product formed is oxaloacetic acid and this is because it is known as C4 cycle. Bundle sheath cells fix CO2, through C3 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:
- Calvin Cycle (C3 Cycle)
- C4 Cycle (Hatch and Slack Pathway)