(A) heart wood is durable, dark and central in position.
(B) Tyloses are balloon like structures of xylem parenchyma in vessel lumen.
(C ) Late wood is formed during spring season.

Options

A. All are correct
B. Only A is correct
C. Only B is incorrect
D. Only C is incorrect

Answer

To analyze the statements regarding heartwood, tyloses, and late wood, let's break down each statement step by step:

### Step-by-Step Solution:

1. **Statement A: Heartwood is durable, dark, and central in position.**
- **Explanation:** Heartwood is indeed the central part of a tree trunk. It is formed from the older xylem that no longer conducts water but provides structural support. Heartwood is typically darker in color due to the accumulation of various substances, including tannins and resins, which enhance its durability. Thus, this statement is **correct**.

2. **Statement B: Tyloses are balloon-like structures of xylem parenchyma in vessel lumen.**
- **Explanation:** Tyloses are indeed balloon-like outgrowths that can form in the vessel elements of xylem. They are produced by the xylem parenchyma cells and can block the vessels, which helps in preventing the spread of pathogens and contributes to the formation of heartwood. Therefore, this statement is also **correct**.

3. **Statement C: Late wood is formed during the spring season.**
- **Explanation:** Late wood, also known as summer wood, is actually formed during the late growing season, which is typically in summer or early autumn, not spring. In contrast, early wood (or spring wood) is formed during the spring when conditions are favorable for growth. Hence, this statement is **incorrect**.

### Conclusion:
- **Correct Statements:** A and B are correct.
- **Incorrect Statement:** C is incorrect.

### Final Answer:
- Only statements A and B are correct, while statement C is incorrect.