Give reason: The wing of a duck does not get | vedclass

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(B) The wings of a duck are coated with a special oily secretion produced by glands in their body. This oil makes the feathers hydrophobic,meaning the

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Due to the presence of an oily secretion on the feathers.

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(B) The wings of a duck are coated with a special oily secretion produced by glands in their body. This oil makes the feathers hydrophobic,meaning they repel water. In terms of surface tension,the angle of contact between the water and the oily surface of the feathers is obtuse $(> 90^{\circ})$. Because the angle of contact is obtuse,the water does not spread over the feathers and instead forms droplets that roll off,preventing the wings from getting wet.

Give reason: The wing of a duck does not get wet in water.

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