Question

The nerve chord in earthworm originates from

• A. Sub-pharyngeal ganglia and has a fused pair of ganglia in each segment from the 5th to the last
• B. Supra-pharyngeal ganglia and has a fused pair of ganglia in each segment from the 3rd to the last
• C. Sub-pharyngeal ganglia and has a fused pair of ganglia in each segment from the 6th to the last
• D. Supra-pharyngeal ganglia and has a fused pair of ganglia in each segment from the 4th to the last

Answer 1

The correct option is A

Sub-pharyngeal ganglia and has a fused pair of ganglia in each segment from the 5th to the last

The ventral nerve cord is solid and double. It arises from the sub-pharyngeal ganglia. It has a fused pair of ganglia in each segment from the 5th to the last.