Question

Suberin is
A. Polysaccharide
B. Protein
C. Fatty substance
D. Pectocellulose

Answer 1

Hint: Suberin is found with the epidermal layer of plane along with cutin and lignins. Suberin is present in different regions of plant for various functions, in roots of plants these are deposited in the radial and transverse layers forming a structure known as casparian strip, they are even present in phellem layers of periderm which is the outermost region of bark.

Complete Answer:
Suberin is a polymeric compound formed from phenylpropanoids, long chain fatty acids and fatty alcohols where phenylpropanoids are linked to each other as lignin. Suberin is also linked with glycerol. This linkage forms a complex of polyesters.

As mentioned above Suberin is a complex of fatty acids which is present in the pet layers of bark along with cutin which also exhibit physical characters as Suberin. Both Suberin and cutin are water insoluble. They are classified under the category called insoluble dietary fibres. They can protect an individual from colorectal cancer.

So the correct answer is option C, Suberin is a poly functional long chain fatty acids molecule.

Note: Most of the fatty acids are soluble in organic solvents and are insoluble in water due to their polar nature, but Suberin is insoluble in organic solvents also. This property of the molecule is due to the linkage between carboxyl and hydroxyl groups within the monomers.