Question

Match the various classes of animals with the examples listed. Choose the answer which gives the correct combination of alphabets of the two columns.

Classes	Examples
A. Polychaeta	p. Scorpion
B. Trematoda	q. Pila
C. Arachnida	r. Liver fluke
D. Gastropoda	s. Nereis
	t. Star fish

• A. A- r, B- s, C- p, D- t
• B. A- s, B- r, C- p, D- q
• C. A- t, B- q, C- s, D- r
• D. A- q, B- s, C- t, D- p

Answer 1

The correct option is B A- s, B- r, C- p, D- q

Polychaeta are a group of annelid worms. These are generally marine like Nereis. This group includes the fan worms and sand worms. These organisms have parapodia which acts like chemosensors.
Liver fluke is a parasitic flatworm. It is a type of helminth. They belong to the class Trematoda. It is common parasite which causes infections in humans and other mammals.
Scorpions are predatory arthropod animals of the order Scorpiones within the class Arachnida. They have a hook like organ. They use this organ for protection and stinging. This organ releases compounds which results in redness, swelling and pain.
Pila is a genus of freshwater snails with an operculum. They belong to the class Gastropoda. The operculum is the opening which helps in sealing the organism when the snail moves inside the shell.
Thus, the correct answer is option B.