Question

Match the entries of column 1 with those of column 2:

Column 1	Column 2
Archeopteryx	Electric organ
Cyclostoma	Fossil birds
Mammals	Dual habitat
Torpedo	Jawless vertebrates
Amphibia	Mammary gland

Answer 1

(A) Archeopteryx (II) Fossil birds:

1. The oldest known Fossil bird is the Archaeopteryx, which comes under the genus of feathered dinosaurs.
2. A full set of teeth, a long bony tail, and on its wings three claws are present for holding the branches.
3. These features are totally different from today's modern birds.
4. It is an evolutionary link between reptiles and birds.

(B) Cyclostoma (IV) Jawless vertebrates:

1. A group of vertebrates that includes living jawless fishes i.e lampreys and hagfishes, comes under Cyclostomata, due to their circular mouth.
2. They are parasitic in nature, and in their adult stages feed on fish.

(C) Mammals (V) Mammary gland:

1. The main characteristic of all female mammals is the presence of milk-producing glands known as mammary glands.
2. It is present in a non-functional form in males.
3. The endocrine system helps in regulating the mammary gland and the hormonal changes that are associated with parturition.

(D)Torpedo (I) Electric organ:

1. A torpedo is an electric fish that produces electrical fields from its electric organs that contain forty-five columns of around seven hundred electrolytes.
2. The electric organ of the torpedo is composed of electrolyte-modified muscles or nerve cells whose main function is to produce strong electric fields for locating their prey and also for their defense from predators.

(E) Amphibia (III) Dual habitat:

1. Amphibians show a dual habitat as they can be found in both aquatic and terrestrial habitats.
2. Their larval form is aquatic in nature and when they become adults, they are able to survive in both terrestrial as well as in aquatic habitats.

Column I	Column II
(A) Archeopteryx	(II) Fossil birds
(B) Cyclostoma	(IV) Jawless vertebrates
(C) Mammals	(V) Mammary gland
(D) Torpedo	(I) Electric organ
(E) Amphibia	(III) Dual habitat