Answer:
(a) Two chambered heart
is present in organisms like fishes. Only one atria and one ventricle is
present which are not separated and hence mixing of oxygenated and deoxygenated
blood blood occurs.
(b) Three chambered
heart develops after the division of auricle into right and left halves as in
amphibian. Mixing of oxygenated and deoxygenated blood occurs in ventricles.
(c) An
intermediary heart is present in reptiles in which ventricle get partially
divided through a septum which is incomplete, e.g., Crocodiles, thus having
four-chambered heart.
(d) In four
chambered heart both the auricle and ventricle are divided into two halves and thus
no mixing of oxygenated and deoxygenated blood occurs, e.g., birds and mammals.
2
chambered heart, (b) and (c) 3 chambered heart, (d) 4 chambered heart
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