Question

Nerve cord is double, ventral & soild in which
of the following animals ?
(A) Pila & Pheretima
(B) Periplaneta & Asterias
(C) Locusta & Ascaris .
(D) Periplaneta & Pheretima​

Answer 1

Explanation:

The ventral nerve cord usually consists of a pair of partially fused nerve trunks running longitudinally along the ventralplane of the animals, from the anterior to posterior (the thoracic and abdominal tagma in the arthropods). ... In some animals, the bilateral ganglia are fused into a single large ganglion per segment