Simple tissues consist of cells that are structurally and functionally similar. They are made up of only one type of cells. Simple tissues are of three types namely parenchyma, collenchyma and sclerenchyma.

Parenchyma: They are living cells and walled, soft in nature due to the presence of thin-walled cells.

Collenchyma: These are characterized by uneven thick-walled living cells.

Sclerenchyma: They have cells with thickened lignified walls, providing them strength and making them waterproof.