A) four pairs of valves and are situated in segments 7 and 9
B) four pairs of valves and are situated in segments 6 and 8
C) three pairs of valves and are situated in segments 8 and 10
D) two pairs of valves and are situated in segments 6 and 11
Correct Answer: A
Solution :
There are four pairs of hearts with valves in the earthworm. Two pairs of lateral hearts, one pair in 7th and one pair in 9th segment. Two pairs of lateral oesophageal hearts in 12th and 13th segments. There are two pairs of lateral loops valves absent. One pair in 10th and one pair in 11th segment. Blood flows in upward direction.
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