Question

Heart of earthworm occur in segments :

• A. 9, 10 and 14, 15
• B. None of these
• C. 7, 9 and 12, 13
• D. 6, 7 and 9, 10

Answer 1

The correct option is C 7, 9 and 12, 13

Pheretima posthuma (earthworm) exhibits a closed type of blood vascular system, consisting of blood vessels, capillaries and heart.



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"