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  • Phasmids areOption: 1 ChemoreceptorsOption: 2 Glandulosensory<div class='qna-

Phasmids are

Option: 1

Chemoreceptors


Option: 2

Glandulosensory


Option: 3

Occur posteriorly


Option: 4

Both B and C


Answers (1)

best_answer

 

 

Nervous System and Sense Organs in Aschelminthes:

  • The nervous system is made up of four nerve cords that run dorsally, ventrally and laterally.
  • These nerve cords fuse near pharynx at the anterior end to form the ‘brain’ 

The following sense organs are present:

  1. Papillae that occur on lips and behind the cloacal aperture. They are tactile in function.
  2. Amphids that are present on the lips and are chemoreceptors.
  3. Phasmids that are present at the posterior end and are glandular sensory in function.
     

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Physiology of Aschelminthes -

Digestion in Aschelminthes

The digestive system is complete with a distinct mouth and anus. Therefore, they have a tube-within-tube type of body plan. Digestion is extracellular. Stomach is absent.

Excretion in Aschelminthes:

  • The excretory system is not well developed in nematodes.
  • The nitrogenous wastes are removed through the process of diffusion via the excretory pores.
  • In marine forms, the rennette glands are present below the pharynx that helps in osmoregulation.

Nervous System and Sense Organs in Aschelminthes:

  • The nervous system is made up of four nerve cords that run dorsally, ventrally and laterally.
  • These nerve cords fuse near pharynx at the anterior end to form the ‘brain’ 

The following sense organs are present:

  1. Papillae that occur on lips and behind the cloacal aperture. They are tactile in function.
  2. Amphids that are present on the lips and are chemoreceptors.
  3. Phasmids that are present at the posterior end and are glandular sensory in function.
     

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Phasmids that are present at the posterior end and are glandular sensory in function.

Posted by

HARSH KANKARIA

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