Q.4Ghe reason
a) Why do some plants feed on insects
b) Briefly explain why animals like cow can not chew their food
properly at the time they take it in
Why do we wear woolen clothes during winter
d) In a mercury thermometer the level of mercury rises when it bulb
comes in contact with a hot object. What is the reason for this rise in
the level of Mercury?
e) The radiators in cars are painted black. Explain why?
f) The handle of a pressure cooker is covered with the thick plastic.
Explain why?
g) The freezer is located at the top of the refrigerator. Explain why?
Answers
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a. Insectivorous plants trap insects because they grow in soil which is usually thin and is also poor in nutrients, so they eat insects to fulfil their nutrient requirement.
b. Animals like cow cannot chew their food properly due to the presence of cellulose in their diet. At the time they take in food, the food is moistend and is sent for cellulose digestion and softening in rumen.
c. In a mercury thermometer, the level of mercury rises when its bulb comes in contact with a hot object. ... Mercury gets expanded on heating, hence its level rises in the capillary when comes in contact with a hot object.
d. As Radiators are heat exchangers used for cooling engines, they are painted with carbon black or Aluminium to cool the engines efficiently. Because black colour absorbs more heat , while light not
e. handle of pressure cooker is covered with thick plastic. ... Plastic is a bad conductor of heat. The pressure cooker is made of metal which can conduct heat. Thus, to protect us from burns, the handles of a pressure cooker is made of plastic.
f. As hot air has lesser density than the colder air and rises above, the freezer is kept at the top section, so that hot air from downward section can rise to the freezer and gets colder.