2007-02-04 04:33:08 · 3 answers · asked by hasan a 1 in Science & Mathematics ➔ Zoology
Symmetry refers to balance. In nature there are three kinds of symmetry. Spherical, radial, and bilateral. The absence of symmetry is called asymmetry. Organisms in the animal kingdom with symmetry exhibit either radial or bilateral symmetry.
In radial symmetry the organism exhibits a circular arrangement with numerous planes that create identical parts. Radial symmetry is analogous to a pie in which the organism may be cut in several planes with each part (piece of pie) being identical. A organism with radial symmetry exhibits no left or right sides. It has a top (oral surface) and a bottom (aboral surface). Animals in the phyla cnidaria and echninodermata exhibit radial symmetry.
In bilateral symmetry a organism can be divided in only one plane producing two mirror image halves. (Note that we are only referring to the external surface when discussing symmetry.) This division produces a left and right side. It is found in animals with cephalization (concentration of sensory organs in the head). These animals move in the direction of their head.
Its the opposite of asymmetrical
2007-02-04 04:46:24 · answer #1 · answered by Anonymous · 0⤊ 0⤋
The study and conservation of Symtrics.
2007-02-04 04:38:49 · answer #2 · answered by Anonymous · 1⤊ 0⤋
A lot of animals and plants are symmetrical. two sides of their body look the same and act the same too.
2007-02-04 04:36:54 · answer #3 · answered by Anonymous · 0⤊ 1⤋