Question

At which of these segments does the nerve cord of the earthworm divide into two parts?

(a) 5^th, 6^th

(b) 8^th, 9^th

(c) 3^rd, 4^th

(d) 11^th, 12^th

I have been asked this question during a job interview.

My doubt is from Animals Structural Organisations in division Structural Organisations in Animals of Biology – Class 11

Answer 1

Correct choice is (c) 3^rd, 4^th

For explanation: The nerve cord of the earthworm bifurcates or divides into two parts at the 3^rd and 4^th segments. It then encircles the pharynx and forms the nerve ring by combining with the cerebral ganglia.