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NTA Abhyas NEET2020BotanyAnimal KingdomPractice

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

Options

  1. ACharacteristics Class Mouth ventral; 5 -7 pairs of gills; skin with placoid scales; persistent notochord Chond
  2. BCharacteristics Class Sucking and circular mouth; jaws present, integument without scales; paired appendages C
  3. CCharacteristics Class Body covered with feathers; skin moist and glandular; hindlimbs form wings; lungs with a
  4. DCharacteristics Class Mammary gland; hair on body; pinnae; two pairs of limbs Mammalia

Correct answer

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

Step-by-step solution

Class Pisces is divided into two groups: Chondrichthyes and Osteichthyes. Chondrichthyes are cartilaginous fishes. These have a ventral mouth, placoid scales while air bladder and operculum are absent. Thus they differ from Osteichthyes. These do not show 5-7 pairs of gill slits. Cyclostomatas are chordates with circular mouth but jaws are absent and hence are known as Agnathas. Class Aves belongs to tetrapods in which fore limbs are modified into wings. All mammals have mammary glands, hair on body and two pairs o

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