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NEET2026BiologyChapterActual

Which of the following organisms exhibits single circulation and possesses a two-chambered heart?

Options

  1. AExocoetus
  2. BSalamandra
  3. CCalotes
  4. DNeophron

Correct answer

A. Exocoetus

Step-by-step solution

Fishes possess a two-chambered heart with an atrium and a ventricle. They exhibit single circulation, where the heart pumps out deoxygenated blood which is oxygenated by the gills and supplied to the body parts, from where deoxygenated blood is returned to the heart. Exocoetus (flying fish) belongs to the class Osteichthyes (bony fishes) and thus has a two-chambered heart and single circulation. Salamandra is an amphibian with a three-chambered heart. Calotes is a reptile with a three-chambered heart. Neophron is a

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