Question

define the parenchyma sclerenchyma and collenchyma

Answer 1

parenchyma- the functional tissue of an organ as distinguished from the connective and supporting tissue

sclerenchyma-strengthening tissue in a plant, formed from cells with thickened, typically lignified, walls.

sclerenchyma-tissue strengthened by the thickening of cell walls, as in young shoots

Answer 2

hiii!!!

here's ur answer...

we know about plant tissues, there are two types of plant tissue. one is meristematic tissue and another one is permanent tissue.

there are two more parts in permanent tissue, which are simple permanent and complex permanent tissue.

Parenchyma, sclerenchyma and collenchyma are example of simple permanent tissue.

PARENCHYMA - it consists unspecialised cells and the cell walls are thin. cells wall is made up of cellulose. cells of parenchyma are living and usually loosely packed. that's why large space is found between the cells of parenchyma. parenchyma store food and provide support to the plants.

parenchyma in plants are called chlorenchyma because of the presence of chlorophyll to perform photosynthesis.

and parenchyma in aquatic plants are called aerenchyma to help them to float.

COLLENCHYMA - the cells of collenchyma are thichkened at the corners. that's why there is little space between them. collenchyma provides flexibility to the plants and also provide mechanical support to the plants. and the cell walls is made up of pectin. cells if this tissue are living.

SCELERENCHYMA - the cells are dead in sclerenchyma and there is no intercellular space between them. the walls of the cell are made up of lignin. it provides strength to the plants. the husk of the coconut is made up of scelerenchyma tissue.

hope this helps..!!