Simple permanent tissue is a type of permanent tissue in plants that has completely grown and lost the ability to divide. It is made up of a single cell type, usually with the same origin, structure, and function. Simple permanent tissue is further classified into three types: parenchyma, collenchyma, and sclerenchyma.

• Parenchyma: This is a simple permanent living tissue that is made up of thin-walled similar isodiametric cells. The cells have an oval or round shape, thin cell walls made up of hemicellulose or cellulose, vacuoles, and a very small nucleus. Parenchyma is found in all parts of the plant and provides support and stores food.

• Collenchyma: This is another type of simple permanent tissue that provides flexibility in plants without breaking and also provides mechanical support. The cells of this tissue are living, elongated, and irregularly thickened at corners. Collenchyma is present below the epidermis in leaf stalks, and intercellular spaces are present.

• Sclerenchyma: This is a type of simple permanent tissue that provides mechanical support and rigidity to the plant. The cells of this tissue are dead, very hard, and rigid in texture. The cells are long, narrow, and have thickened walls due to the presence of lignin.

In summary, simple permanent tissue is a type of permanent tissue in plants that is made up of a single cell type and has lost the ability to divide. It is further classified into three types: parenchyma, collenchyma, and sclerenchyma, each with its unique characteristics and functions.