In $C_4$ plants, $C_3$ cycle takes place in
- Companion cells
- Bundle sheath cells
- Mesophyll cells
- Bulliform cells
The Correct Option is B
Approach Solution - 1
In \( C_4 \) plants, the \( C_3 \) cycle (Calvin cycle) occurs specifically in the bundle sheath cells. These cells are adapted to maintain high concentrations of \( CO_2 \) due to the spatial separation of carbon fixation (which happens in mesophyll cells) and the Calvin cycle. The \( C_4 \) pathway initially fixes carbon in mesophyll cells as oxaloacetate (a 4-carbon compound), which is then transported to bundle sheath cells where \( CO_2 \) is released for use in the \( C_3 \) cycle.
Thus, the correct answer is (B) Bundle sheath cells, as they are the site of the \( C_3 \) cycle in \( C_4 \) plants.
Approach Solution -2
In C₄ plants, photosynthesis is spatially separated between two cell types: mesophyll cells and bundle sheath cells. The initial fixation of CO₂ into a four-carbon compound occurs in mesophyll cells. This four-carbon compound is then transported to bundle sheath cells, where it is decarboxylated to release CO₂ for the Calvin cycle (C₃ cycle). Rubisco, the enzyme responsible for CO₂ fixation in the Calvin cycle, is localized exclusively in the bundle sheath cells, ensuring efficient carbon fixation under high light and temperature conditions.
Thus, the correct answer is (B) Bundle sheath cells.
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III. Julius Von Sachs (1884): Green parts in plants produce glucose which is stored as starch.
IV. C. Van Niel (1931): Photosynthesis is essentially a light dependent reaction in which hydrogen from an oxidizable compound reduces CO2 to form carbohydrates.
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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)