Question

Unio have
A) One chambered heart
B) Two chambered heart
C) Three chambered heart
D) No heart

Answer 1

Unio have many chambered heart

Answer 2

Answer:

Option C, three chambered heart is the correct answer.

Explanation:

• Unio is an example of mollusc.
• Molluscs have an open circulatory system, i.e., they do not have proper vessels for conduction of fluid or blood.
• Unio also have a heart with three chambers – one ventricle and two atria.
• The haemolymph is collected from the gills, pumped through the heart, and it is released directly in the tissue spaces from where again the impure blood is sent to the gills and the cycle continues.

Therefore, option C is the correct answer. Unio being a mollusc has a three chambered heart with 1 ventricle and 2 lateral auricles.

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