Question

write a short note on collenchyuma

Answer 1

Collenchyma is a simple permanent plant tissue. it contains living cells which are capable of cell division. the cells are closely arranged without any spaces between and are thick walled at corners. the cellwall is made up of hemicellulose and pectin.

They generally occur in pedicel and petiole. it provides mechanical support nd flexibilty to the regions where they occur.

Answer 2

Ontogenetically, collenchyma cells develop from certain elongated cells resembling procambium which are formed in the very early stages of differentiation of the meristem. Some­times less specialised collenchyma originates from the ground meristem. Some researchers believe that the collenchyma originates jointly with the vascular tissues from the procambium.

Collenchyma occurs in the peripheral positions i.e. immediately beneath the epidermis in stems, leaves, floral parts, fruits and roots of dicotyledonous plants mainly. Collen­chyma is not found in the stems of many mono- cots. It occurs as continuous band of solitary or many cell-layers thick hypodermis under the epi­dermis.