The ballon shaped structure called tyloses

Options

A. Resin canals
B. Xylem parenchyma
C. Sieve elements
D. Xylem vessels

Answer

### Step-by-Step Solution:

1. **Understanding Tyloses**: Tyloses are balloon-shaped structures that form in the xylem vessels of certain plants, particularly in the heartwood.

2. **Formation of Tyloses**: These structures originate from the xylem parenchyma cells. The xylem parenchyma cells extend into the xylem vessels and swell to form tyloses.

3. **Composition of Tyloses**: Tyloses are typically composed of lignified cell walls, which means they contain lignin, a complex organic polymer that provides rigidity and structural support to the plant.

4. **Function of Tyloses**: The primary function of tyloses is to block the xylem vessels. This blockage prevents the conduction of water and nutrients, which is a key function of xylem vessels.

5. **Presence of Other Compounds**: In addition to lignin, tyloses may also contain tannins and resins, which can contribute to the plant's defense mechanisms against pathogens.

6. **Conclusion**: Based on the information above, the correct answer to the question about the balloon-shaped structure called tyloses is that they are derived from xylem parenchyma.

### Final Answer:
The balloon-shaped structure called tyloses is formed from the xylem parenchyma.