1. describe and give the functions of three major categories of plant tissues.

Some of the most important types of plant tissue system and their function are as follows:

1. Epidermal Tissue System 2. Ground Tissues System 3. Vascular Tissue System.

All the tissues of a plant which perform the same general function, regardless of position or continuity in the body, constitute the tissue system. The tissues of a plant are organized to form three types of tissue systems: the dermal tissue system, the ground tissue system, and the vascular tissue system.

All the tissues of a plant which perform the same general function, regardless of position or continuity in the body, constitute the tissue system. The tissues of a plant are organized to form three types of tissue systems: the dermal tissue system, the ground tissue system, and the vascular tissue system.

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The components and functions of the tissue systems are summarized below:

The cells of epidermis are parenchymatous having protoplasm and nucleus without intercellular spaces. Epidermis possesses numerous minute openings called stomata. Main function of stomata is exchange of gases between the internal tissues and the external atmosphere. Cuticle is present on the outer wall of epidermis to check evaporation of water. Epidermis forms a Protective layer in leaves, young roots, stem, flower, fruits etc.

It includes all the tissues of the plant body except epidermal and vascular tissues.

It is divided into following parts:

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(i) Hypodermis:

It is situated below the epidermis. It is multilayered and made up of parenchymatous and sclerenchymatous cells.

the cell theory states that all living things including animals, as well as plants, are made of cells.