Ladder like nervous system is characteristic of which phylum.
a) Annelida
b) Platyhelminthes
c) Mollusca
d) Chordata

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

Explanation:

b) Platyhelminthes – Members of Platyhelminthes possess a ladder-like nervous system with a ventral nerve cord. Correct answer: Option B

a) Annelida – Annelids have a primitive brain and paired nerve cords connected to ventral and anterior ganglia across their segments. Leeches belong to the subclass Hirudinea, which is part of Annelida and closely related to Oligochaetes. Option A is not correct

c) Mollusca – Molluscs have three main pairs of ganglia: cerebral, pedal, and pleural ganglia. These are connected by cerebra-pedal and pleuro-pedal cords. This phylum includes a wide diversity of animals that play significant ecological roles. Option C is not correct

d) Chordata – Chordates are characterized by a dorsal hollow nerve tube and a notochord, both of which may expand into tubes or vesicles during development. Option D is not correct

Watch 3-min video & get full concept clarity