You will get information about this on page no. 70 & 71 of ncert book of science class 9.

Possible answer:

Plant tissues: Parenchyma, Collenchyma, and Sclerenchyma

Plant tissues are groups of cells with similar structures and functions that occur in various parts of the plant body. Three types of plant tissues are parenchyma, collenchyma, and sclerenchyma.

Parenchyma:

Parenchyma is a simple plant tissue composed of thin-walled living cells that have large central vacuoles and carry out various metabolic activities, such as photosynthesis, storage, and secretion. Parenchyma cells are found in the leaves, stems, roots, and fruits of plants and exhibit different shapes and sizes depending on their functions. For example, chlorenchyma cells in leaves contain chloroplasts for photosynthesis, while aerenchyma cells in roots contain air spaces for oxygen transport.

Sources of Parenchyma:

Parenchyma can be found in various parts of the plant body such as leaves, stems, roots, and fruits.

Collenchyma:

Collenchyma is a simple plant tissue composed of elongated living cells with thickened cell walls that provide mechanical support and flexibility to the plant. Collenchyma cells are usually found in the stems, petioles, and leaves of young plants and appear as elongated strands or cylinders with unevenly thickened walls. Collenchyma cells are capable of stretching and bending without breaking, allowing the plant to adapt to changing environmental conditions.

Sources of Collenchyma:

Collenchyma can be found in the stems, petioles, and leaves of young plants.

Sclerenchyma:

Sclerenchyma is a simple plant tissue composed of thick-walled dead cells that provide mechanical support and protection to the plant. Sclerenchyma cells are usually found in the mature parts of the plant such as the stem, bark, seed coat, and fruit wall. Sclerenchyma cells have two types: fibers and sclereids. Fibers are elongated cells with tapered ends that form bundles in the stem and are used for support and reinforcement. Sclereids are short cells with various shapes that occur singly or in groups and are used for defense and storage.

Sources of Sclerenchyma:

Sclerenchyma can be found in the mature parts of the plant such as the stem, bark, seed coat, and fruit wall.

Conclusion:

In summary, parenchyma, collenchyma, and sclerenchyma are three types of simple plant tissues that have different structures and functions. Parenchyma cells are thin-walled living cells that carry out metabolic activities, collenchyma cells are elongated living cells with thickened walls that provide support and flexibility, and sclerenchyma cells are thick-walled dead cells that provide support and protection. These tissues can be found in various parts of the plant body and play important roles in plant growth, development, and survival.