Tissues

A group of cells with similar structure, organised to do a common function is called tissue.

A) Plant tissues: On the basis of the dividing capacity,  plant tissues are basically of two types:

• Meristematic
• Permanent

Meristematic: consists of actively-dividing cells. On the basis of region of plant where it is present: meristems are of three types

1. Apical Meristem: Apical meristems are present on the growing tips of stems/roots to increase the length  of plant
2. Intercalary Meristem: present on the base of leaves or internodes
3. Lateral Meristem: Present on the lateral sides of roots and stems to increase the thickness 

Permanent: Fromed from meristematic tissues, the cells in the tissue loose the ability to divide. Permanent plant tissues are of two types: 

1. Simple: are made up of one type of cells
1. Parenchyma
2. Collenchyma
3. Sclerenchyma
2. Complex: are made up of more than one type of cells
1. Xylem
2. Phloem

Animal tissues:

• Epithelial
• Squamous:
• Cuboidal:
• Columnar:
• Ciliated:
• Connective
• Proper
• Skeletal or supportive
• Fluid or vascular
• Muscular
• Striated
• Nonstriated/Smooth
• Cardiac
• Nervous