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Q.

In fishes, the blood that passes through the heart is

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a

oxygenated blood.

b

deoxygenated blood.

c

mixed blood.

d

colourless blood.

answer is B.

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Detailed Solution

Fishes have a 2-chambered heart with an atrium and a ventricle.Single circulation is observed in them ; Gills→Oxygenated blood→Body tissues→Deoxgenated blood→Heart→Gills.So, only deoxygenated blood passes through the heart of fishes which is why it is referred to as venous heart.

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