A) radial
B) bilateral
C) spherical
D) biradial
Correct Answer: B
Solution :
In bilaterally symmetrical animals, the response 10 external stimulus is quicker and more precise. In bilaterally symmetrical animals, the anterior end as differentiated into head with the concentration of nervous tissue and nightly efficient sense organs so the bodily functions become more coordinated and the response to external stimuli is quicker and more precise. Radial, spherical and biradial symmetry are approximate characteristic of lower organisms as in some invertebrates in which response is weak and slower.
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