(a) Name the plant tissue found in the husk of coconut and also identify the chemical which is responsible for its stiffness. (b) Give one way in which it differs from parenchymatous cells.

(a) Plant tissue in husk of coconut is sclerenchyma fibres.
Reason for stiffness of sclerenchyma is deposition of lignin in cell walls of its cells.
(b) Sclerenchyma fibres are thick walled dead cells while parenchyma cells are thin walled living cells.