Botany vs Zoology - NEET Biology Chapter-Wise Weightage Trends (2021-2025)

Nervous system of Earthworm MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET

Quick Facts

  • 10 Questions around this concept.

Solve by difficulty

Pheretima and its close relatives derive nourishment from :

In earthworm, nerve ring lies in

Concepts Covered - 0

Neural system of Earthworm

Neural system of Earthworm

Nervous system 

  • In earthworm, the nervous system consists of ventral paired nerve which enlarges in each segment and form segmental ganglia
  • The nerve cord in the region of 3rd and 4th segment (anterior region) bifurcates, encircles the pharynx laterally and connects to the cerebral ganglia dorsally in order to form a nerve ring
  • Nerve ring is formed by the connection of cerebral ganglia with subpharyngeal ganglion along with circumpharyngeal connectives
  • Presence of nerve ring is a characteristic of earthworm
  • The cerebral ganglia and associated nerves in the nerve ring receive and process the sensory outputs which are converted into responses of the body

Sense organs 

  • The sensory system does not have eyes but does possess light and touch receptor cells
  • The sensory receptors of animal include three types of receptors i.e. tactile receptors, buccal receptors and photoreceptors
  • Epidermal or tactile receptors- distributed on the lateral and ventral surface of the body and are related to touch. These help to feel the vibrations in the ground
  • Buccal receptors- These are related to digestion and present in the buccal chamber
  • Photoreceptors- These are related to light and are present on dorsal surface of the body

"Stay in the loop. Receive exam news, study resources, and expert advice!"

Get Answer to all your questions