Question

Define the following:;;
(a) Lignin
(b) Suberin
(c) Cutin
In a well mannered way

Answer 1

(c)=a waxy water-repellent substance in the cuticle of plants, consisting of highly polymerized esters of fatty acids.
(b)=an inert impermeable waxy substance present in the cell walls of corky tissues
(a)=Lignin-polysaccharide complexes of the plant cell wall and their effect on microbial degradation in the rumen

Answer 2

1) Lignin- A complex organic compound that binds to cellulose fibers and hardens and strengthens the cell walls of plants. Lignin is a polymer consisting of various aromatic alcohols, and is the chief noncarbohydrate constituent of wood.
2) Suberin- A polyester composed of fatty acids and aromatic compounds that occurs naturally in the cell walls of cork tissue in plants. Suberin acts together with waxes to protect plant surfaces from water loss and microbial attack, and also helps to close tears and breaks.
3) Cutin- An insoluble mixture containing waxes, fatty acids, soaps, and resinous material that forms a continuous layer on the outer epidermal wall of a plant.