Which of the following is not correct ?

Options

A. Early wood is characterized by a large number of xylary elements.
B. Late wood is characterzed by a large number of xylary elements.
C. Early wood is characterized by vessels with wider cavities.
D. Late wood is characterized by vessels with narrow cavities.

Answer

To determine which statement is not correct regarding early wood and late wood, we can analyze each option based on the characteristics of these two types of wood.

### Step-by-Step Solution:

1. **Understand Early Wood:**
- Early wood, also known as spring wood, is produced during the early part of the growing season.
- It is characterized by:
- A large number of vessels with wider cavities.
- Thinner cell walls, making it less dense.
- A greater number of gallery elements.

2. **Understand Late Wood:**
- Late wood, also known as autumn wood, is produced later in the growing season.
- It is characterized by:
- A smaller number of vessels with narrower cavities.
- Thicker cell walls, making it denser.
- Fewer gallery elements.

3. **Analyze Each Statement:**
- **Option A:** "Early wood is characterized by a large number of gallery elements."
- This statement is correct based on the characteristics of early wood.
- **Option B:** "Late wood is characterized by a large number of gallery elements."
- This statement is incorrect. Late wood has fewer gallery elements.
- **Option C:** "Early wood is characterized by vessels with wider cavities."
- This statement is correct as early wood has wider vessels.
- **Option D:** "Late wood is characterized by vessels with narrower cavities."
- This statement is also correct since late wood has narrower vessels.

4. **Identify the Incorrect Statement:**
- The only incorrect statement among the options is **Option B**, which states that late wood is characterized by a large number of gallery elements.

### Final Answer:
The statement that is not correct is **Option B**: "Late wood is characterized by a large number of gallery elements."