Question

Match the terms given in column 'A' with those in column 'B'.

	Column A		Column B
a)	Nematoda	i.	an organism with a 4- chambered heart, a body covering of hair, external ears and suckles its young.
(b)	Mammalia	ii.	shelled organism with a large flat foot and one or more pairs of tentacles.
(c)	Echinodermata	iii.	a roundworm which has a 3-lipped mouth, is parasitic in the intestine of man.
(d)	Arthropoda	iv	a terrestrial organism with two pairs of jointed appendages attached to each of its many body segments and respires through tracheae.
(e)	Mollusca	v.	a spiny- skinned marine organism with calcareous exoskeleton, with radial symmetry, body parts occurring in fives and a water vascular system.
(f)	Agnatha	vi.	a jawless, parasitic vertebrate which attaches to, and sucks blood from fishes.
(g)	Reptilia	vii.	a limbless land animal without external ears but with forked tongue.

Answer 1

• Nematodes are very small, slender roundworms, Common parasitic species of nematodes in human include ascarids (Ascaris), filariasis, hookworms, pinworms (Enterobius), and whipworms (Trichuris trichiura).
  
• Mammalia are 4-chambered heart and the body is covered with hair and external ears are present. And they gives birth to young ones and suckles them on udders or breasts.
• Echinodermata are recognizable by their (usually five-point) radial symmetry, and are spiny-skinned with calcareous exoskeleton which include marine organisms such as starfish, sea urchins, sand dollars, and sea cucumbers.
• Arthropoda are terrestrial organisms distinguished by their jointed limbs and cuticle made of chitin, often mineralised with calcium carbonate. The arthropod body plan consists of segments, each with pairs of appendages. They respire through tracheae.
• Mollusca are shelled organisms with a large foot and tentacles. These are the second-largest phylum of invertebrate animals after the Arthropoda.
• Agnatha are jawless fishes which depends on other fishes. Hagfish and lampreys suck blood or bore into their bodies and eat them from the inside out. While jaw fishes are called Gnathostomata.
• Reptilia are limbless organisms without external ears but with forked tongue (like snake).
  (a) - iii; (b) - i; (c) - v; (d) - iv; (e) - ii; (f) - vi; (g) - vii