In `C_(4)` plants, the bundle sheath cells

Options

A. Have thin walls to facilitate gaseous exchange
B. Have large intercellular spaces
C. Are rich in PEP Carboxylase
D. Have a high density of chloroplasts

Answer

**Step-by-Step Solution:**

1. **Understanding Bundle Sheath Cells in C4 Plants:**
- C4 plants have a unique photosynthetic pathway that involves specialized cells known as bundle sheath cells. These cells play a crucial role in the process of photosynthesis.

2. **Evaluating the Statements:**
- We have four statements regarding the characteristics of bundle sheath cells in C4 plants. We need to determine the accuracy of each statement.

3. **Statement 1: "Bundle sheath cells have thin walls to facilitate gaseous exchange."**
- This statement is **incorrect**. Bundle sheath cells actually have **thick walls**, which do not facilitate gaseous exchange. Instead, they are designed to protect the inner tissues and maintain the integrity of the vascular bundles.

4. **Statement 2: "They have large intercellular spaces."**
- This statement is also **incorrect**. In C4 plants, bundle sheath cells are tightly packed in a ring-like structure along with mesophyll cells, which means there are **no large intercellular spaces**.

5. **Statement 3: "These cells are rich in PEP carboxylase."**
- This statement is **incorrect**. The enzyme **PEP carboxylase** is primarily found in the mesophyll cells of C4 plants, not in the bundle sheath cells. Instead, bundle sheath cells are rich in the enzyme **rubisco**, which is essential for the Calvin cycle.

6. **Statement 4: "They have a high density of chloroplasts."**
- This statement is **correct**. Bundle sheath cells contain a high density of **chloroplasts** and **chlorophyll**, which are necessary for the process of photosynthesis to occur effectively.

7. **Conclusion:**
- Based on the evaluation of the statements, the only correct statement regarding bundle sheath cells in C4 plants is that they have a high density of chloroplasts.

**Final Answer:**
- The correct statement is: "They have a high density of chloroplasts."

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