Assertion : In fishes, heart is venous. Reason : Only veins are present in the heart of fishes.A. If both the assertion and the reason are true and the reason is a correct explanation of the assertionB. If both the assertion and reason are true but the reason is not a correct explanation of the assertionC. If the assertion is true but the reason is falseD. If both the assertion and reason are false

Assertion : In fishes, heart is venous. Reason : Only veins are presen

1.	Assertion : In fishes, heart is venous. Reason : Only veins are present in the heart of fishes.A. If both the assertion and the reason are true and the reason is a correct explanation of the assertionB. If both the assertion and reason are true but the reason is not a correct explanation of the assertionC. If the assertion is true but the reason is falseD. If both the assertion and reason are false
Answer» Correct Answer - C In fishes, the heart is mainly two chambered one auricle and one ventricle. Heart of Scoliodon receivers only deoxygenated or venous blood, hence named as venous heart. The auricle opens to the ventricle through atrioventricular aperture. Mainly the impure blood passes from the heart to the gills only once. Therefore they have single circulation only.