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Biological Symmetry
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What is biological symmetry?
Biological symmetry
is the
arrangement of body parts
about the
central axis
which ends in the
creation of geometric designs.
What is an axes?
An axes is an
imaginary line
which
passes through the center of the body.
What are the extremitites of axes called?
The extremities of axes are called
poles
. Which
maybe similar (homopolar)
or
different (heteropolar).
Example
: anteria and posteria
Name the three types of biological symmetry.
They are:
Spherical Symmetry (ball)
Radial Symmetry (wheel)
Bilateral Symmetry
What is speherical symmetry?
It is any plane through
the centre of the body producing halves
which are
mirror images of each other.
This type favours
rolling or floating movements
.
What is radial symmetry?
Radial Symmetry
are
parts which radiate from the central or longitutual axis
; consentric parts (havin same center).
This type
favours sessile or sedentary
mode of living
Stationary organisms who dont move about. eg coral and sponges.
It also
enables animals
to respond
equally on all sides.
What is bilateral symmetry?
Bilateral symmetry
consits of only
one plane (mid-saggittal)
which divides the
organism in halves
which are
mirror images
of each other.
This type of symmetry is marked by
head specialization
called
Cephalisation.
Bilateral symmetry favours
rapid, forward motion.
What is Cephalisation?
Cephalisation
is the
concentration of sense organs in the head region.
Author
birdyfbaby
ID
33392
Card Set
Biological Symmetry
Description
Talking about the different types of biological symmetry
Updated
2010-09-08T07:27:34Z
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