8-9. Choose the correct answers. Answers may be used more than once or not at al

Question

8-9. Choose the correct answers. Answers may be used more than once or not at all. a. radiation b. evaporation 8. A lizard can gain heat from a warm rock. This is an example of 9. A sea lion sits in the sun and gets direct warmth from the sun. This is called c. convection d. conduction 10. Countercurrent exchange in a dolphin's fin is one way to: a. conserve energy b. recapture thermal energy c. cool down the blood d. avoid evaporative heat loss 11·The reason you might lose your nose if you are trapped in a very cold place for a long time IS: a. your nose is more exposed so blood rushes to it b. vasoconstriction in the extremities c. vasodialation in the extremities d. your body is going into torpor

Explanation / Answer

8. Conduction. When the lizard sits on the warm rock, heat is transferred from the rock to the lizard. This is called conduction of heat.

9. Radiation. Sea lion gets the warmth by the sun's radiation.

10. Countercurrent exchange helps an organism in minimizing heat loss. thus option b. recapturing the thermal energy is coorect.

11.Vasoconstriction in the extremeties leads to frostbite and hence the loss of nose.

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