Match List - I with List - II and choose the correct answer.

List - I	List - II
(a) Lenticles	(i) Phellogen
(b) Cork cambium	(ii) Suberin deposition
(c) Secodnary cortex	(iii) Exchange of gases
(d) Cork	(iv) Phelloderm

The correct option is: a - (iii) b - (i) c - (iv) d - (ii).

To understand the matching, let us analyze the anatomical terms related to secondary growth in woody plants:

(a) Lenticles matches with (iii) Exchange of gases:
Lenticels (spelled as lenticles in the list) are lens-shaped openings that form in the bark of woody stems. They arise when the cork cambium produces loosely arranged parenchymatous cells that rupture the epidermis. These pores permit the exchange of gases between the internal tissues of the stem and the surrounding atmosphere.

(b) Cork cambium matches with (i) Phellogen:
As a woody plant grows in girth, the outer tissues (epidermis and cortex) are stretched and broken. To form a protective layer, a lateral meristem develops in the outer cortical region, which is scientifically known as the cork cambium or phellogen.

(c) Secondary cortex matches with (iv) Phelloderm:
The phellogen cuts off cells on both its outer and inner sides. The cells produced on the inner side differentiate into a thin layer of parenchymatous cells called the secondary cortex or phelloderm.

(d) Cork matches with (ii) Suberin deposition:
The cells produced on the outer side of the phellogen differentiate into cork (also known as phellem). The cell walls of mature cork cells are heavily deposited with a waxy, organic substance called suberin, which makes them highly impermeable to water and gases.

Matching the columns accordingly:
(a) Lenticles → (iii) Exchange of gases
(b) Cork cambium → (i) Phellogen
(c) Secondary cortex → (iv) Phelloderm
(d) Cork → (ii) Suberin deposition