Question

Suberin in chiefly deposited in the cell of
(a)Sclerenchyma
(b)Collenchyma
(c)Cork
(d)Phelloderm

Answer 1

Hint: It is found in certain tissues of various underground organs, such as roots, tubers, and stolons, and in periderm layers. It can also be formed in response to wounding and to pathogen-induced defenses of certain organs and cell types. It is comprised of a long-chain of fatty acids and glycerol

Complete answer:
The suberin is a wax-like fatty substance, which occurs in cork cell walls and in or between other cells. On alkaline hydrolysis, it yields chiefly suberic acid. It is highly hydrophobic in nature and its main function is to prevent water from penetrating the tissue. The suberin is collected in the radial and transverse cell walls of the endodermal cells in the roots. This structure is called the Casparian strip or Casparian band. The suberin is present in the phellem layer of the periderm (or cork). This is the outermost layer of the bark. In suberin, the cells which are present in this layer are dead and abundant, which prevents water loss from the tissues below. Suberin is a primary constituent of cork and is named after the cork oak, Quercus suber.

Additional Information: Suberin, lignin, and cutin are complex polymer structures that occur in cell walls of some specific type of cell. These are present in very small quantities in food plants but they have a significant role in protection against colorectal cancer. Suberin is very unique and distinct from other non-carbohydrate cell walls biopolymers such as lignin and cutin for several reasons:
(1) It is mainly formed by an assembly of two different polymeric domains, one poly (phenolic) and the other poly (aliphatic),
(2) Each of the domain has a unique chemical composition
(3) In the same cells, both of the domains are present.
So, the correct answer is ‘Cork’.

Note: The suberin polymer contains a variety of ${ C16 -{ C24 } }$ chain-length aliphatics, such as ω-hydroxy fatty acids, α,ω-dicarboxylic fatty acids, and primary fatty alcohols. Suberin can also contain high amounts of glycerol and phenolics, especially ferulic acid. Additionally, non-covalently linked waxes are likely associated with the suberin polymer.