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Bundle sheath cells...

Bundle sheath cells

A

Lack RuBisCO

B

Lack both RuBisCO and PEP carboxylase

C

Are rich in RuBisCO

D

Are rich in PEP carboxylase.

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Bundle Sheath Cells**: - Bundle sheath cells are a type of plant cell that surround the vascular bundles (xylem and phloem) in the leaves of certain plants, particularly those that undergo C4 photosynthesis. 2. **Identifying Key Enzymes**: - The two key enzymes mentioned are RuBisCO (Ribulose-1,5-bisphosphate carboxylase/oxygenase) and PEP carboxylase (Phosphoenolpyruvate carboxylase). - RuBisCO is primarily involved in the Calvin cycle, while PEP carboxylase is involved in the initial fixation of carbon dioxide in C4 plants. 3. **Analyzing the Options**: - **Option 1**: "Bundle sheath cells are rich in RuBisCO" - This statement is true. Bundle sheath cells do contain RuBisCO as they are involved in the Calvin cycle. - **Option 2**: "Lack both RuBisCO and PEP carboxylase" - This statement is false. Bundle sheath cells do contain RuBisCO. - **Option 3**: "Are rich in RuBisCO" - This statement is correct, as previously established. - **Option 4**: "Are rich in PEP carboxylase" - This statement is false. PEP carboxylase is primarily found in mesophyll cells, not in bundle sheath cells. 4. **Conclusion**: - The correct answer is that bundle sheath cells are rich in RuBisCO (Option 3). ### Final Answer: Bundle sheath cells are rich in RuBisCO. ---
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Mesophyll chloroplast and Bundle sheath chloroplast