Which of the following statement is incorrect ?

Options

A. In a dicot stem, the pericycle is usually multilayered.
B. Wood is the common name used for secondary xylem.
C. Peripheral cytoplasm,alarge vacuole and a prominent nucleus, all are absent in a mature sieve tube element.
D. Lenticels are the aerating pores presentin bark of plants and are associated with gaseous exchange.

Explanation

To determine which statement is incorrect, we will analyze each of the four statements provided.

### Step-by-Step Solution:

1. **Analyze Statement 1:**
- **Statement:** In a dicot stem, the pericycle is usually multilayered.
- **Evaluation:** This statement is correct. The pericycle in dicot stems is indeed multilayered or few-layered thick, located just inside the endodermis.

2. **Analyze Statement 2:**
- **Statement:** Wood is the common name for secondary xylem.
- **Evaluation:** This statement is also correct. Wood is primarily composed of secondary xylem, which forms as a result of secondary growth in plants.

3. **Analyze Statement 3:**
- **Statement:** Peripheral cytoplasm, a large vacuole, and a prominent nucleus are all absent in a mature sieve tube element.
- **Evaluation:** This statement is incorrect. Mature sieve tube elements do have a peripheral cytoplasm and a prominent nucleus, although the large vacuole can push the cytoplasm to the periphery. Therefore, saying these features are absent is incorrect.

4. **Analyze Statement 4:**
- **Statement:** Lenticels are aerating pores present in the bark of plants and are associated with gaseous exchange.
- **Evaluation:** This statement is correct. Lenticels facilitate gas exchange in the bark of plants, similar to how stomata function in leaves.

### Conclusion:
- The incorrect statement is **Statement 3**: "Peripheral cytoplasm, a large vacuole, and a prominent nucleus are all absent in a mature sieve tube element."