A group of cells that are similar in structure and/or work together to achieve a particular function forms a tissue.

• Plant tissues are of two main types – meristematic and permanent.

• Meristematic tissue is the dividing tissue present in the growing regions of the plant.

• Permanent tissues are derived from meristematic tissue once they lose the ability to divide. They are classified as simple and complex tissues.

• Parenchyma, collenchyma and sclerenchyma are three types of simple tissues. Xylem and phloem are types of complex tissues.

• Animal tissues can be epithelial, connective, muscular and nervous tissue.

• Depending on shape and function, epithelial tissue is classified as squamous, cuboidal, columnar, ciliated and glandular.The different types of connective tissues in our body include areolar tissue, adipose tissue, bone, tendon, ligament, cartilage and blood.

• Striated, unstriated and cardiac are three types of muscle tissues.

• Nervous tissue is made of neurons that receive and conduct impulses.