What
Symmetry? Describe the different
types of Symmetry
in the animal Kingdom
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11th
Biology
Animal Kingdom
Classification of Animals
Describe types of symmetry ...
Biology
Describe types of symmetry in animals.
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Spherical Symmetry:
In this type of symmetry, the body of the individual can be divided into similar halves by any plane passing through the center, e.g. Volvox, some sponges, and some corals.
Radial Symmetry:
In this type of symmetry, the body of the individual divided into equal halves by any plane passing through the center from top to bottom. This type of symmetry is found in some sponges (Sycon), cnidarians (e.g. Hydra jelly), and echinoderms (e.g. starfish). When the body can be divided into two similar halves by one or two vertical planes only, the radial symmetry is called biradial symmetry. It is present in the sea anemones.
Bilateral Symmetry:
In this type of symmetry, the body can be divided into two equal halves by a single plane only because the important body organs are paired and occur on the two sides of a central axis. Bilateral symmetry is found in many invertebrates and all vertebrates. The right and left sides of the body are called the lateral sides.
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Answer:
Que : What is Symmetry?
Ans : Symmetry in everyday language refers to a sense of harmonious and beautiful proportion and balance. In mathematics, "symmetry" has a more precise definition, and is usually used to refer to an object that is invariant under some transformations; including translation, reflection, rotation or scaling.
Que : Describe the different types of Symmetry in the animal Kingdom
Ans: Types of Symmetry:
• Asymmetrical : Cannot be divided into equal halves through median plane. e.g., Sponges.
• Radial symmetry : Any plane passing through central axis can divide organism into equal halves. e.g., Hydra.
• Bilateral symmetry : Only one plane can divide the organism into equal halves. e.g., Annelids and Arthropods.