Question

Lateral hearts and lateral oesophageal hearts in earthworm respectively are present in

• A. 12,13 th segments and 7,9 th segments
• B. 7,9 th segments and 12 th, 13 th segments
• C. 8,9 th segments and 13 ,14 th segments
• D. 13,14 th segments and 8,9 th segments

Answer 1

The correct option is B

7,9 th segments and 12 th, 13 th segments

The dorsal and ventral vessels are connected to each other in segments 7, 9, 12 and 13 by means of paired pulsatile hearts. The hearts in 12^th and 13^th segments are called lateral oesophageal hearts while the anterior pairs in the 7^th and 9^th segments are called lateral hearts.