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Q.

In frog, nictitating membrane

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a

receives sound signals

b

protects the eyes while in water

c

helps in producing croaking sound

d

covers and protects the heart

answer is B.

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Detailed Solution

In frogs, eyes are bulged and are covered by a nictitating membrane that protects them while in water.

Sound signals are received by tympanum.

Heart is covered by a membrane called pericardium.

Vocal sacs help in croaking sound in male frogs.

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