Question

Lignified or thickened cell wall is a characteristic feature of collenchyma b) aerenchyma c) parenchyma d) sclerenchyma

Answer 1

Lignified or thickened cell wall is a characteristic feature of d) sclerenchyma.

Sclerenchyma:

• One of the three types of ground, or foundational, tissue in plants is sclerenchyma; the other two types are collenchyma and parenchyma or live thin-walled tissue (living support tissue with irregular walls).
• Sclerenchyma cells come in a wide range of sizes and forms, but there are primarily two types: sclereids and fibers.
• The secondary wall gives the cell and tissue a significant amount of stiffness and hardness. It is very thick and extensively lignified (15%–35%).
• Sclerenchyma's primary job is to give plants mechanical support and strength.
• The plant organs are supported structurally by them.
• They encircle nuts and seeds in protective sheaths.
• Additionally, they make up conductive tissues and are a component of vascular bundles.

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Answer 2

Answer:

The correct answer to the question-"Lignified or thickened cell wall is a characteristic feature of collenchyma b) aerenchyma c) parenchyma d) sclerenchyma" is-

d) sclerenchyma

Explanation:

The Lignified or thickened cell wall is a characteristic feature of -

d) sclerenchyma.

Sclerenchyma

• It is one of the three types of  fundamental tissue in plants;
• Its cells occur in many different shapes and sizes, but the  two main types occur-

       a) fibres and

       b) sclereids.

• It provides strength and  mechanical support to the plants.
• They are a part of vascular bundles and  thus form conductive tissues.
• They are the protective coverings around nuts and seeds.
• They have the following walls-

    a) primary and

     b)secondary walls.

• The secondary wall here is thick and highly lignified (15%–35%)and so imparts great rigidity and hardness to the cell and the tissue.

• sclerenchyma  possesses long, narrow cells,
• The mature Sclerenchyma tissue is composed of dead cells
• Its cells are empty and devoid of protoplasm.

• Sclerenchyma are the main mechanical tissues of plants.
• The main types of sclerenchyma cells are-

      a)fibres and

      b) sclereids .

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