K.C.S.E Biology Q & A - MODEL 2003PP1QN17
Some students used a model to demonstrate the effect of sweating on human body temperature. Two boiling tubes A and B were filled with hot water. The temperature of water in the tubes was taken at the start of the experiment and then at 5 minutes interval. The surface of tube A was continuously wiped with a piece of cotton wool soaked in methylated spirit. The results obtained are shown in the table below.
a) On the same axes, plot graphs of temperature of water in the tubes against time.
b) At what rate was the water – cooling in tube A? c) Why was tube B included in the set up? d) Account for the rate of cooling in tube A. e) State two processes of heat loss in tube b. f) What would be the expected results if tube A was insulated? g) What would the insulation be comparable to in: i) Bird ii) Mammals? h) Name the structures in the human body that detect: i) External temperature changes ii) Internal temperature changes
answers
​ b) 80 – 18 = 62; 2.48C /Min
2.5 25 c) Control d) Rate was faster in tube A; because the film of methylated sprit evaporated; removing heat from the tube; e) Convection ; radiation f) Lower rate of heat loss; g) i) birds Feather ii) Mammals? Fur h) i) external temperature changes Temperature ii) Internal temperature changes Hypothalamus Follow AtikaSchool.Org on our Social ChannelsThis gives you an opportunity to get our latest uodates, changes and firsthand information Don't give up, Keep Searching for more |
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