Question

Match the following and find the appropriate option.

	List - I		List - II
A	Ganoid scales	1	Pigeon
B	Uropygial gland	2	Polypterus
C	Placoid scales	3	Frog
D	Poison gland	4	Cartilagenous fish

• A. A- 1, B- 2, C- 3, D- 4
• B. A- 2, B- 1, C- 3, D- 4
• C. A- 1, B- 2, C- 4, D- 3
• D. A- 2, B- 1, C- 4, D- 3

Answer 1

The correct option is D A- 2, B- 1, C- 4, D- 3

Polypterus has diamond-shaped ganoid scales, each of which is comprised of a series of layers, like in a sandwich. Placoid scales are found on cartilaginous fish including sharks. These scales, also called denticles, are similar in structure to teeth, and have one median spine and two lateral spines. The uropygial gland, known as the preen gland or the oil gland, is a bilobate sebaceous gland possessed by the majority of birds. It is located dorsally at the base of the tail. The amphibian poison glands produce mucus by a merocrine method of secretion. These glands function as protective devices.