Read the given statements characterising certain types of animals. Select the option which correctly exemplifies each of these types.

(i) Animal having external gills.
(ii) Animal having internal gills.
(iii) An animal showing tracheal respiration.
(iv) Animal revealing buccopharyngeal respiration.

(i) Prawn (ii) Arenicola (iii) Unio (iv) Fish

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(i)Necturus (ii) Unio (iii)Prawn (iv)Frog

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(i) fila (ii) Arenicola (iii) Unio (iv)Toad

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(i) Necturus (ii) Pila (iii) Millipede (iv)Toad

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Solution

The correct option is D (i) Necturus (ii) Pila (iii) Millipede (iv)Toad
Necturus (Mud puppy, Amphibia) possesses three pairs of external gills.
Pila (Apple snail, Mollusca) respires by means of gills (ctenidium) in water and by a pulmonary sac on land.
Millipedes (Arthropoda) respire by tracheae (tracheal respiration).
Toads (Amphibia) exhibit buccopharyngeal respiration.
So, the correct answer is (D).

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Read the given statements characterising certain types of animals. Select the option which correctly exemplifies each of these types.(i) Animal having external gills.(ii) Animal having internal gills.(iii) An animal showing tracheal respiration.(iv) Animal revealing buccopharyngeal respiration.