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Question

In earthworm two pairs of heart are found in segments of one side only of

A
9, 10, 14 and 15
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B
7, 9, 12 and 13
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C
6, 7, 9 and 10
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D
None of the above
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Solution

The correct option is B 7, 9, 12 and 13
There are four pairs of valvular, muscular and pulsatile hearts situated in the 7th, 9th, 12th and 13th segments. Out of these four pairs, the two anterior ones of the 7th and 9th are called as lateral hearts, while those of 12th and 13th segments are called as latero-esophageal hearts. So, the correct answer is option B.

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