Question

Tyloses are found in

• A. Sclereids
• B. Sclerenchyma Xylem
• C. Sclerenchyma phloem
• D. Sclerenchyma fibres

Answer 1

The correct option is B

Sclerenchyma Xylem

The correct option is B.

Explanation of the correct option:

1. Tyloses are balloon-like swellings produced by the bulging of the cell wall of the adjacent wood parenchyma or medullary ray cell through the pit openings into the cavity of the vessel.
2. Sclerenchyma xylem contains tyloses.
3. Sclerenchyma fibers are thick elongated, and spindle-shaped cells with pointed tips.
4. When there are unfavorable conditions, such as drought, or when a plant or vascular bundles are infected, the function of these cells is visible.
5. The formation of tyloses may be induced in many plants by wounding and thus by pruning, tyloses produce to block the cut vessels.

Explanation of the incorrect options:

Option A:

1. Sclereids are variable in shape, often branched, and may occur singly or in groups in ground tissues throughout the plant.
2. Their function is primarily for protection.
3. These are reduced forms of sclerenchyma.
4. Small sclerenchyma cells with highly-thickened lignified cell walls have a narrow lumen.

Option C:

1. Phloem is the principal food in the conducting tissue of vascular plants.
2. During secondary growth, sclerenchyma phloem is generated.

Option D:

1. Sclerenchyma fibers are thick elongated, and spindle-shaped cells with pointed tips.
2. They are narrow lumen with simple rounded pits and lignifies secondary walls.
3. Provide mechanical support to the plant parts.
4. Fibers sclerenchyma of fruits and seeds helps in seed dispersal.
5. Sclerenchyma fibers are cells that have been stretched out.

Final answer: Tyloses are found in Sclerenchyma xylem.