Q.

Assertion (A): In birds, air sacs facilitate continuous oxygenation of blood and pneumaticity of bones

Reason (R): In birds, lungs are compact, spongy, undistensible and without alveoli

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a

Both (A) and (R) are correct, but (R) is not correct explanation to (A)

b

(A) is correct, but (R) is incorrect

c

(A) is incorrect, but (R) is correct

d

Both (A) and (R) are correct, and (R) is the correct explanation to (A)

answer is B.

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Detailed Solution

In birds, lungs are compact, spongy, undistensible and without alveoli

In birds, air sacs facilitate continuous oxygenation of blood and pneumaticity of bones.

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Assertion (A): In birds, air sacs facilitate continuous oxygenation of blood and pneumaticity of bonesReason (R): In birds, lungs are compact, spongy, undistensible and without alveoli