Write the components and functions of plant tissue system?
Answers
Answer:
Plant Tissues
A collection of cells performing a specific function is called tissue. Plant tissues can be grouped into plant tissue systems each performing specialized functions. A plant tissue system is defined as a functional unit, connecting all organs of a plant. Plant tissue system is also grouped into various tissues based on their functions.
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Explanation:
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.
1. Epidermal Tissue System:
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.
2. Ground Tissues System:
It includes all the tissues of the plant body except epidermal and vascular tissues.
It is divided into following parts:
(i) Hypodermis:
It is situated below the epidermis. It is multilayered and made up of parenchymatous and sclerenchymatous cells.
(ii) General Cortex:
This consists of parenchymatous cells with or without chloroplasts.
(iii) Endodermis:
Endodermis is single layered made up of parenchymatous cells. The radial and internal walls of endodermal cell are thickened; a band of lignin or suberin knows as casparian strip is sometimes found on the radial and transverse wall of every cell.
(iv) Pericycle:
It is single or multilayered and is situated in between endodermis and vascular bundles. It is made up of sclerenchymatous and parechymatous cells.