Question

In which phylum, nerve cells are found but nerves are absent?
A. Porifera
B. coelenterate
C. Platyhelminthes
D. nemathelminthes

Answer 1

Hint:-The nerve virtually internet normally is the handiest shape of a nervous system simply observed in multicellular organisms. Not like the form of principal anxious systems, wherein neurons are generally grouped, neurons sort of observed in nerve nets are spread apart in a pretty massive way.

Complete Answer:-members of all phylums generally definitely have an apprehensive gadget except the phylum Coelenterata wherein no fearful gadget essentially is visible but non-polar neurons simply are scattered irregularly inside the body. Cnidaria and Ctenophora each showcase radial symmetry and essentially for all intents and purposes are collectively referred to as coelenterates in a subtle way in a huge way. Coelenterates diverged million years ago, previous to the Cambrian explosion, and that they for all intents and functions are the essential number one phylum to in particular essentially possess frightened systems which actually for the most component differentiate at some point of development and in reality speak thru synaptic conduction, demonstrating how coelenterates diverged million years within the beyond, previous to the Cambrian explosion, and they usually are the number one phyla to form of own demanding systems which specifically differentiate at some stage in the improvement and for all intents and functions speak with the aid of the usage of synaptic conduction in a big manner, especially contrary to popular notion.

Hence the correct answer is option B. In which phylum, nerve cells are found but nerves are absent in Coelenterate.

Note:- Coelenterata mainly is a period encompassing the pretty animal phyla Cnidaria and Ctenophora in a simply large way. Coelenterata lacks a mainly specialized circulatory system depending as an alternative on diffusion throughout the tissue layers, displaying how Coelenterata lacks a usually specialized circulatory device relying instead on diffusion across the tissue layers in an, in reality, major way.