Seals have oly fir and ducks have oily feathers. (Hint: think properies of water

Question

Seals have oly fir and ducks have oily feathers. (Hint: think properies of water.) 38. What is the adaptive advantage of this? 39. Desert temperatures can fluctuate dramatically between night and day. Wil the fluctuations in the temperature of a cactus, which is composed mostly of water, be equal to the temperature fluctuations of the desert air? Explain. 40. Trees transport water through microscopic tubes within their trunks. What properties of water contribute to this phenomenon? 41. Water is polar and fat is non-polar. Therefore, fats are not soluble in water. Within your smal intestine, bile from the liver is used to break-down large globules of fat into smaller globules of fat. This process known as emulsification aids in digestion of fat. You performed two activitios today that simulated emulsification of lipids. Identify these activities. 42. When you boil water on the stove, the pot heats up faster than the water. Explain this phenomenon.

Explanation / Answer

38. Seals are warm blooded animal. In freezing cold ocean, they maintain their body temperature by blubber which is smooth thick layer lying underneath their skin. Besides this their fur also keep them warm.

Ducks have preen gland positioned near their tails. This gland produces oil and ducks rub this over their feathers with their beaks to maintain their waterproof effect. This oil creates a protective barrier that stops feathers becoming waterlogged. Not only this, but also these waterproof feathers insulate ducks from water and cold temperatures.

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