Symmetry - metazoa, Biology

Assignment Help:

Symmetry - Metazoa

All living organisms have some body shape and form. The general body plan of animals may be organized in one of several ways . Arrangement of parts or organs on either side of an imaginary dividing line or around a common axis or radially around a point so that opposite parts are mirror images of one another is called symmetry. There are two broad divisions of symmetry,

(i) Primary, or embryonic

(ii) Secondary, or adult.

2039_Symmetry - Metazoa.png

Figure:  Different types of body symmetries

The latter may or may not be the same as the primary one. For example, the larva of starfish is bilaterally symmetry but the adult starfish is radially symmetrical. The primary symmetry is bilateral and secondary symmetry is radial. With regard to symmetry animals can be basically of five types

  • Asymmetrical
  • Spherical
  • Bilateral
  • Radial and
  • Biradial

 

 


Related Discussions:- Symmetry - metazoa

What are non-threshold approaches, Non-threshold  approaches For  gene...

Non-threshold  approaches For  genetic carcinogenes, the  "NOEL-safety factor"  approach  is generally  not considered a suitable method for setting the acceptable intake level

Show the value of embryology, Q. Show the value of embryology? The valu...

Q. Show the value of embryology? The value of embryology in solving taxonomic problems can be appreciated by studying some specific cases. Amongst the classical examples cited

Define etiology and clinical features of epilepsy, Define Etiology and Clin...

Define Etiology and Clinical Features of Epilepsy? This disorder usually starts in childhood, with the peak incidence between birth and two years. Etiological factors include

Grading of stenosis and grading of coronary artery disease, Q. Grading of S...

Q. Grading of Stenosis and Grading of Coronary Artery Disease? Multiple views are necessary to quantify coronary stenosis accurately. Further, there should be no foreshortening

Zoonoses disease-erysipeloid, Erysipeloid A zoonosis called erysipelas ...

Erysipeloid A zoonosis called erysipelas in animals, rose disease in pig, erysipaloid in man is caused by Erysipelothrix rhusiopathiae (insidiosa). Other names given to this co

What is spermatogenesis in human biology, What is Spermatogenesis in human ...

What is Spermatogenesis in human biology? The male sex cells, or sperm, are produced in the oval-shaped testes, the primary sex organs of the male reproductive system, in a pro

Explain the appearance of the pupil, Explain the Appearance of the Pupil ...

Explain the Appearance of the Pupil The pupil should appear round and regular. The normal diameter  is  2-4 mm. On stimulation by  light,  the pupil  constricts, so as  to redu

Show the signs and symptoms of implant failure, Q. Show the Signs and sympt...

Q. Show the Signs and symptoms of implant failure? Signs and symptoms of implant failure are : 1.  Horizontal mobility beyond 0.5 mm or any clinically observed vertical move

Importance of forests - fuel wood, Importance of Forests - Fuel Wood T...

Importance of Forests - Fuel Wood The forests are renewable resources which provide us a wide variety of commodities. For man, forests have been a source of recreation and the

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd