A) Solid ventral nerve cord
B) Dorsal tubular nerve cord
C) Paired nerve cord
D) Ganglionated nerve cord
Correct Answer: B
Solution :
Dorsal tubular nerve cord is dorsal, hollow, fluid filled nerve cord. It is formed by infolding of a mid-dorsal strip of ectoderm and generally sinks below surface. It lies above the notochord and outside the coelom. It persists throughout life in most chordates, but in few it degenerates before maturity.
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