Which of the following statement is INCORRECT regarding the structures in the plant ?

Options

A. In the dicot root, the vascular cambium is associated with secondary growth.
B. Wood is the common name used for secondary xylem.
C. A mature sieve tube element lacks peripheral cytoplasm , a large vacuole and a prominent nucleus.
D. Lenticels are the aerating pores present in the bark of plants and are associated with gaseous exchange.

Answer

To determine which statement is incorrect regarding the structures in plants, we will analyze each statement provided in the question step by step.

### Step 1: Analyze the first statement
**Statement:** In the dicot root, the vascular cambium is associated with secondary growth.

**Analysis:**
- The vascular cambium is indeed a type of lateral meristem that contributes to secondary growth in dicots. It is responsible for the formation of secondary xylem and phloem, which increases the girth of the plant.
- This statement is **correct**.

### Step 2: Analyze the second statement
**Statement:** Wood is the common name for the secondary xylem.

**Analysis:**
- Wood is primarily composed of secondary xylem, which is formed as a result of secondary growth. The primary xylem is typically crushed as the plant grows, leading to a predominance of secondary xylem in mature stems.
- This statement is also **correct**.

### Step 3: Analyze the third statement
**Statement:** A mature sieve tube element lacks peripheral cytoplasm, a large vacuole, and a prominent nucleus.

**Analysis:**
- Mature sieve tube elements are part of the phloem and do indeed lack a prominent nucleus. However, they do possess peripheral cytoplasm and a large vacuole. Therefore, the claim that they lack peripheral cytoplasm and a large vacuole is incorrect.
- This statement is **incorrect**.

### Step 4: Analyze the fourth statement
**Statement:** Lenticels are the aerating pores present in the bark of the plant and are associated with gaseous exchange.

**Analysis:**
- Lenticels are indeed structures that facilitate gas exchange in plants. They form when the outer bark cells break down during secondary growth, allowing for the exchange of gases.
- This statement is **correct**.

### Conclusion
After analyzing all four statements, we find that the third statement is the only incorrect one.

### Final Answer
The incorrect statement regarding the structures in plants is: **"A mature sieve tube element lacks peripheral cytoplasm, a large vacuole, and a prominent nucleus."**

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