Question

Symmetry found in Sea Anemone is
A) Radial
B) Biradial
C) Bilateral
D) Spherical

Answer 1

Hint:Sea Anemone is cnidarian and sessile in nature i.e it cannot move on its own.They are named after the anemone, a terrestrial flowering plant, because of the colourful appearance of many.

Complete Answer:
To answer this question, we need to first understand what is symmetry and its types-
In biology, symmetry is the regular repetition of parts of an organism in an orderly interval. It is following types-
1) Radial symmetry is a type of symmetry where cutting through the centre of the structure in any direction produces two halves that are mirror images of each other. Animals of the phylum Cnidaria (e.g. jellyfish) and Echinodermata (e.g. starfish) are radially symmetrical.
2) Biradial symmetry – It is the organisation or arrangement of various parts of the organism such that similar parts are located to either side of the axis and each of the four sides of the body is mirror image to the opposite side but different from the adjacent (the side it is right next to) side.
3) Bilateral symmetry- Here, the body can be divided into two halves that are mirror images of each other along one plane only. Bilaterally symmetrical animals are characterized by a type of movement in which one end of the body always leads.
4) Spherical symmetry- Here, there can be a very high number of symmetry axes through the body. The spherical symmetry occurs in an organism if it is able to be cut into two identical halves through any cut that runs through the center of the organism.
Biradial symmetry is especially suitable for sessile animals such as the sea anemone in the Cnidarians.

Hence, the correct answer is option B (Biradial).

Note: Sea Anemone Is mostly the aquatic animals which have radial symmetry. Due to the high likeliness of immobility that comes with the symmetry, they have very slow mobility.