Tissue is a group of cells that are similar in structure and are organised together to perform a specific task.

In multicellular organisms, the different types of tissues perform different functions. Since a particular group of cells carry out only a particular function, they do it very efficiently. So, multicellular organisms possess a definite division of labour.

Simple permanent tissues are of three types:→ Parenchyma
→ Collenchyma

→ Sclerenchyma

Parenchyma tissue is of further two types:

• Aerenchyma

• Chlorenchyma

Apical meristem is present at the growing tips of stems and roots.

Sclerenchyma tissue makes up the husk of coconut.

The constituents of phloem are:
→ Sieve tubes
→ Companion cells
→ Phloem parenchyma
→ Phloem fibres

Muscular tissue

Neuron look like a star shaped cell with a tail.