Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which of the following is true about preen gland? (1) Occur in birds (2) Also known as uropygial gland (3) Occur in bats (4) help in digestionA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: B
Solution :
In birds, skin is dry and skin glands are absent except the oil glands or preen glands (uropygial glands) that are located at the base of the tail However, these glands are absent in parrot and ostrich. These glands secrete oily substance. which makes the body waterproof. Bats are flying mammals so, preen glands are absent in them.
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