During ascent,water column present inside vessels and tracheids,does not rupture due5 to

Options

A. Transpiration pull
B. Weak graviational pull
C. lignified thick walls
D. cohesion and adhesion

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Context**: The question asks why the water column in vessels and tracheids does not rupture during its ascent in plants.

2. **Key Concepts**:
- **Transpiration Pull**: This is the primary force that drives the upward movement of water in plants. It is created by the evaporation of water from the leaves, which creates a negative pressure that pulls water upward from the roots.
- **Cohesion**: This refers to the attraction between water molecules. Cohesion helps to maintain the integrity of the water column, preventing it from breaking under tension.
- **Adhesion**: This is the attraction between water molecules and the walls of the xylem vessels. It helps water to stick to the walls, aiding in its ascent.
- **Surface Tension**: This property allows water molecules to resist external forces, contributing to the stability of the water column.
- **Tensile Strength**: This is the ability of the water column to withstand pulling forces without breaking.

3. **Factors Preventing Rupture**:
- The water column does not rupture due to the combined effects of cohesion and adhesion, which provide high tensile strength to the water column.
- The lignified thick walls of tracheids and vessels also help to withstand the pressure and prevent rupture.

4. **Conclusion**: The water column in vessels and tracheids remains intact during ascent primarily due to cohesion and adhesion, which provide the necessary tensile strength to resist the pulling forces generated by transpiration pull.

**Final Answer**: The water column present inside vessels and tracheids does not rupture during ascent due to cohesion and adhesion, which provide high tensile strength.

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