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A tissue is a group of cells, in close proximity, organized to perform one or more specific functions. There are four basic tissue types defined by their morphology and function: epithelial tissue, connective tissue, muscle tissue, and nervous tissue.
It covers most organs and cavities within the body. It also forms a barrier to keep different body system separate. Epithelial tissues help in absorption of water and nutrients.
The function of epidermis is the protection of plant from injury and infection. Cuticle of epidermis also helps to reduce water loss by evaporation to prevent dessication. Stomata present in the epidermis allow gaseous exchange to occur during photosynthesis and respiration. It also facilitates transpiration.
Xylem, plant vascular tissue that conveys water and dissolved minerals from the roots to the rest of the plant and also provides physical support. Xylem tissue consists of a variety of specialized, water-conducting cells known as tracheary elements.
There are two kinds of protective tissues: the epidermis and the suber or cork.
epidermis
epidermis and cork cells are known as protected tissue because epidermis and cork cells protect the plant from water loss and protects the plant from insects. epidermis and cork cells had waxy coating known as cutin and suberin which helps the plant from water loss .
Simple permanent tissues are again classified into three main types. They are parenchyma, collenchyma, and sclerenchyma.
three types
Simple tissues are tissues composed of cells that are structurally and functionally similar i.e. they are made up of only one type of cell. Types of simple tissues in plants: i. Parenchyma.
The cells of simple tissue perform similar function. The cells of complex tissue may perform different functions. Example of simple tissues are collenchymas, parenchyma. Examples of complex tissues are xylem and phloem.
REVIEW SHEET
Type of tissue Simple/complex | Cell types present | |
---|---|---|
Parenchyma | Simple tissue | Parenchyma |
Collenchyma | Simple tissue | Collenchyma |
Sclerenchyma | Simple tissue | Fibers Sclereid |
Xylem | Complex tissue | Tracheary elements, parenchyma, Sclerenchyma (fibers) |
IF the tissues are composed of cells which are functionally and structurally similar, then they are called SIMPLE TISSUES….Difference Between Simple And Complex Tissue.
Simple Tissues | Complex Tissues |
---|---|
Nature of the Tissue | |
Homogenous | Heterogenous |
Example | |
Parenchyma, Collenchyma, Sclerenchyma | Xylem, phloem |
The types of simple tissues are parenchyma, collenchyma, sclerenchyma and aerenchyma.