Which of the following is not true about early wood?

Options

A. a) It is formed during spring season
B. b) It has a lower density than late wood
C. c) Its vessels have wider lumen
D. d) It is produced when activity of cambium is lesser.

Answer

### Step-by-Step Solution:

1. **Understanding Early Wood**:
- Early wood, also known as spring wood, is a type of secondary xylem produced by the cambium during the spring season when the cambium is highly active.

2. **Characteristics of Early Wood**:
- It is formed during the spring season.
- It has a lower density compared to late wood (autumn wood).
- The vessels and tracheids in early wood have wider lumens.
- It is produced when the activity of cambium is high.

3. **Analyzing the Statements**:
- **Statement A**: "It is formed during spring season."
- This is true, as early wood is indeed formed in the spring.
- **Statement B**: "It has lower density than late wood."
- This is also true; early wood has lower density due to less fiber production.
- **Statement C**: "Its vessels have wider lumen."
- This statement is true; early wood has vessels with wider lumens.
- **Statement D**: "It is produced when activity of cambium is lesser."
- This statement is false; early wood is produced when the cambium is highly active.

4. **Conclusion**:
- The statement that is not true about early wood is **Statement D**. Therefore, the correct answer is **D**.