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Animal Kingdom — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYAnimal Kingdom1 Mark
MCQ
Choose the correct pair.
  • A
    Hippocampus – 3-chambered heart.
  • B
    Rana – 2-chambered heart.
  • C
    Crocodilus – 4-chambered heart.
  • D
    Pavo – 3-chambered heart.
✓

Answer

  1. Crocodilus – 4-chambered heart.

Explanation:

Hippocampus (seahorse) belongs to class Osteichthyes. It has 2-chambered heart (one auricle and one ventricle). Rana (frog) belongs to class Amphibia. It has a 3-chambered heart (two auricles and one ventricle). Crocodilus (crocodile) belongs to class reptilia. It is an exception in reptiles. Pavo (peacock) belongs to class aves. It has 4-chambered heart.

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