Four pair of hearts in earthworm occur in segments

9, 10, 14 and 15

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7, 9, 12 and 13

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6, 7, 9 and 10

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none of these

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Solution

The correct option is B 7, 9, 12 and 13
Earthworm exhibits a closed type of blood vascular system, consisting of blood vessels, capillaries and heart. In earthworm, in each of the segments 7, 9, 12 and 13 is found a pair of large, thick, muscular and rhythmically contractile vertical vessels, called hearts.

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X	8	10	12	11	9	7	13	14	15
Y	5	7	9	8	6	4	10	11	12

8, 7, 9, 10, 12, x

14

12

x

^{'} -^{'}

3, 20, 18, 14 : 5, 14, 9, 7 :: 6, 15, 12, 10 : ?

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