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Q.

Assertion (A) : Radial symmetry is an advantage to sessile animals.
Reason ( R) :  They live in water and respond equally to stimuli that arrive from all directions.

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a

A and R are true, R is correct explanation for A

b

A is true.  But R is false

c

A is false.  But R is true. 

d

A and R are true, but R is not correct explanation for A

answer is A.

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Detailed Solution

In sessile animals, body parts are arranged around the central axis of the body, they can receive external stimuli in all directions . Hence radial symmetry is advantageous for them.

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