Which of the following represents the correct combination without any exception ?

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Characteristics-Sucking and circular mouth; jaws absent, integument without scales; paired appendages; Class-Cyclostomata

Characteristics-Body covered with feathers; skin moist and glandular, fore-limbs form wings; lungs with air sacs; Class-Aves

Characteristics-Mammary gland; hair on body;pinnae; two pairs of limbs; Class-Mammalia

Characteristics-Mouth ventral; gills without operculurn; skin with placoid scales; persistent notochord; Class-Chondrich- thyes

answer is D.

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Detailed Solution

In Chondrichthyes, mouth is ventral, gills lack operculum, skin has placoid scales, notochord is persistent (Ref. NCERT Textbook)Note: There are exceptions like Chimera which has an operculum covering the gill-slits on each side. Such an exception must be ignored (not covered in the NCERT textbook) while selecting the most appropriate answer. Cyclostomes do not have In birds, skin is dry and without glands, except for the oil gland present at the base of the tail.In mammalia, pinnae are absent in some (e.g., monotremes, whales, dolphins). Two pairs of limbs are not present in all e.g., in whales, forelimbs are modified into flippers and hindlimbs are vesitigial.

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