Question

Classify the following based on the number of chambers in their hearts.

Rohu, Scoliodon, Frog, Salamander, Flying lizard, King cobra, Crocodile, Ostrich, Pigeon, Bat, Whale.

• A. (i) Two-chambered heart: Frog, Salamander
  (ii) Three-chambered heart: Rohu, Scoliodon
  (iii) Incomplete four-chambered heart: Flying lizard, King cobra
  (iv) Complete four-chambered heart: Crocodile, Ostrich, Pigeon, Bat, Whale
• B. (i) Two-chambered heart: Rohu, Scoliodon
  (ii) Three-chambered heart: Frog, Salamander
  (iii) Incomplete four-chambered heart: Flying lizard, King cobra
  (iv) Complete four-chambered heart: Crocodile, Ostrich, Pigeon, Bat, Whale
• C. (i) Two-chambered heart: Frog, Salamander
  (ii) Three-chambered heart: Rohu, Scoliodon
  (iii) Incomplete four-chambered heart: Crocodile, Ostrich, Pigeon, Bat, Whale
  (iv) Complete four-chambered heart: Flying lizard, King cobra
• D. (i) Two-chambered heart: Rohu, Scoliodon
  (ii) Three-chambered heart: Frog, Salamander
  (iii) Incomplete four-chambered heart: Flying lizard,Pigeon, Bat, Whale
  (iv) Complete four-chambered heart: Crocodile, Ostrich, King cobra

Answer 1

The correct option is B (i) Two-chambered heart: Rohu, Scoliodon

(ii) Three-chambered heart: Frog, Salamander
(iii) Incomplete four-chambered heart: Flying lizard, King cobra
(iv) Complete four-chambered heart: Crocodile, Ostrich, Pigeon, Bat, Whale

Fishes are the aquatic and cold-blooded animals with a two-chambered heart. For example, Rohu (Labeo rohita), Dogfish (Scoliodon), Electric ray (Torpedo), Seahorse (Hippocampus), etc.

Amphibians have mucus glands in the skin and three-chambered heart. For example, Frogs, Toads, Salamanders, etc.

Reptiles like flying lizard, King Cobra have incomplete four-chambered heart.

All mammals and birds possess four-chambered heart like Ostrich, Pigeon, Bat, whale, etc. Crocodile is the only reptile that possesses a four-chambered heart.

Therefore, the correct answer is option B.