Question

The nerve chord in earthworm originates from

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

Answer 1

Answer: (C)

The ventral nerve cord in earthworm originated from the sub-pharyngeal ganglia and has fused pair of ganglia in each segment from the $5^\text{th}$ to the last.