what is symmetry? explain the types of symmetry.
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Answer:
Symmetry is defined as a balanced and a proportionate similarity which is found in two halves of an object, that is, one-half is the mirror image of the other half. The imaginary line or axis along which you can fold a figure to obtain the symmetrical halves is called the line of symmetry.
1] Radial symmetry: The organism looks like a pie. This pie can be cut up into roughly identical pieces.
2] Bilateral symmetry: There is an axis; on both sides of the axis the organism looks roughly the same.
3] Spherical symmetry: If the organism is cut through its center, the resulting parts look the same.
4] Rotational symmetry, also known as radial symmetry in biology, is the property a shape has when it looks the same after some rotation by a partial turn. An object's degree of rotational symmetry is the number of distinct orientations in which it looks exactly the same for each rotation.
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Symmetry refers to the uniformity in the organisation of a body through which it cut either be cut in a plane, many planes, or none.
The three types of symmetry are as follows;
1. Asymmetry; In this, body can't be divided into equal halves passing through any plane. Eg, porifera.
2. Radial; In this, body can be divided into equal halves passing through any plane. Eg, coelentrata, ctenophora & echinodermata.
3. Bilateral; In this, body can be divided into two equal halves passing through only one plane. Eg, Platyhelminthes, aschelminthes, annelida, arthropoda, mollusca, hemichordata, chordata.
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