Question

Differentiate between the three types of simple permanent tissue on the basis of their structure, location and function

Answer 1

Answer:

The cells of the permanent tissues do not generally  divide further.

Permanent tissues having all cells  similar in structure and function are called simple  tissues.

Simple permanent tissue is further classified into three types:

Parenchyma

• The cells have an oval or round shape.
• The cell wall is made up of hemicellulose or cellulose.
• The cell is thin-walled.
• The cells have vacuoles and very small nucleus.
• It is found in all parts of the plant.
• The protoplasm is living and dense.

Collenchyma

• Cells are long and thick walled.
• The cell wall is made up of cellulose and pectin.
• It is the only tissue with the highest refractive index due to the presence of pectin.
• It is found in hypodermis of dicot stem and the vascular bundle of dicot leaf.
• The amount of chloroplast is less in the cells and have no intercellular spaces.
• They provide mechanical support to the  growing parts of the plant such as young stem and  petiole of a leaf.

Sclerenchyma

• These are dead tissues without protoplast , very hard and rigid in texture.
• Cells are thick walled with various size and shapes.
• These provide mechanical support and rigidity to the plant.