--%>
Assignment Help - homework help

Characterization of symmetry and nervous system

Describe the characterization of symmetry and nervous system in echinoderms?

E

Expert

Verified

Adult echinoderms, all along with cnidarians, are the animals which present radial symmetry, that is, their body structures are distributed around a center. Radial symmetry in echinoderms though is a secondary radial symmetry, as their larval phase has bilateral symmetry and the radial pattern emerges only in adult individuals (that is, there are few adult echinoderms with lateral symmetry). All other animals contain lateral symmetry with the exception of poriferans (that is, no symmetry is stated for them).

Echinoderms do not existed in cephalization and they contain a diffuse network of nerves and neurons made up of a neural ring around the mouth and of radial nerves which ramify to follow the pentaradial structure of body.

   Related Questions in Biology

  • Q : Importance of Departmentation Need or

    Need or importance of Departmentation The basic need for Departmentation arises because of specialization of work and the limitation on the number of subordinates th

    		•
  • Q : What is Revenue Growth Revenue Growth :

    Revenue Growth: It illustrates sales decreases or increases over time. This is used to measure how quick a business is expanding. Additionally valuable than a snapshot of revenue, revenue growth assists investors identify trends so as to gauge revenue

    		•
  • Q : Aerobic respiration to the pyruvic acid

    What occurs throughout aerobic respiration to the pyruvic acid molecules made up by glycolysis? What is the series of reactions which then follows?

    		•
  • Q : Main theoretical models-Formation of

    What are the main theoretical models that try to explain the formation of the enzyme-substrate complex?

    		•
  • Q : FSH Describe the event which marks the

    Describe the event which marks the start of the menstrual cycle? Also give details of blood concentration of FSH, estrogen and LH and progesterone within this stage of cycle?

    		•
  • Q : Stage in which cell cycle has longer

    In common which stage of the cell cycle has longer duration?

    		•
  • Q : Respiratory pigments Explain how do

    Explain how do respiratory pigments act?

    		•
  • Q : Features of delegation of authority

    Features of delegation of authority Delegation is authorization to a manager to act in a certain manner. The degree of delegation prescribed the limits within which

    		•
  • Q : Recent Developments-Technology

    a) "Knowledge portals" available on employees' individual desktop PCs or PDAs for easy access to all useful data in the organization. b) Software that transforms text and numbers into charts and graphs to make it easier to glean relevant information. c) More sophisticated filters,

    		•
  • Q : Where in plants is large amount of the

    Where in plants is large amount of the IAA found?

    		•