A) 7, 9, 12 and 13
B) 11,14, 17 and 18
C) 10,13,16 and 17
D) 4, 5,10 and 13
Correct Answer: A
Solution :
In Pheretima, in segment number 7, 9, 12 and 13 four pairs (ie, one pair in each) lateral blood vessels are present, which are called hearts. Out of there, the lateral blood vessels of 7th and 9th segment are called lateral hearts. The lateral blood vessels of 12th and 13th segment are called lateral oesophageal hearts.
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