Q.86 Which one of the following animals possesses two chambered heart?
(A) Chameleon (B) Peacock (C) Gold fish (D) Blue whale
The goldfish possesses a two-chambered heart. This structure, consisting of one atrium and one ventricle, is typical for fish in exams like CSIR NET Life Sciences. Among the options, only the goldfish fits this description.
Option Analysis
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(A) Chameleon: As a reptile, chameleons have a three-chambered heart with two atria and one ventricle, allowing partial separation of oxygenated and deoxygenated blood.
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(B) Peacock: Peacocks, being birds, possess a four-chambered heart (two atria and two ventricles) for efficient circulation supporting high metabolism.
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(C) Gold fish: Goldfish, a teleost fish, have a two-chambered heart (atrium and ventricle), though anatomically including sinus venosus and bulbus arteriosus; the pumping chambers are two.
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(D) Blue whale: Blue whales, as mammals, feature a four-chambered heart for complete separation of blood flows.
Which animal possesses two chambered heart? In biology, particularly for competitive exams like CSIR NET Life Sciences, understanding heart structures across vertebrates is crucial. A two chambered heart, with one atrium and one ventricle, suits aquatic animals with single-circuit circulation where blood goes from heart to gills for oxygenation then to the body.
Heart Chambers in Vertebrates
Fish typically have two chambered hearts for efficient gill-based respiration. Reptiles like chameleons advance to three chambers, while birds (peacock) and mammals (blue whale) have four for double circulation.
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Goldfish (fish): Confirmed two pumping chambers.
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Chameleon (reptile): Three chambers.
Why Goldfish is Correct
Goldfish exemplify the two chambered heart in Pisces, pumping deoxygenated blood to gills without separation needs.
This knowledge aids evolutionary biology and comparative anatomy studies in CSIR NET.
