Tuesday, October 23, 2012

Water and Its conservation Lesson:15 Class VI Science, CBSE/NCERT

CBSE NCERT Chapter -15: Water Solved Questions
Answer these questions

1.Why do wet clothes placed on a clothes line get dry after some time? Explain.
Ans: it is due to evaporation of water by the heat of the sun
2. Wet clothes dry faster if you keep them under a fan. Why? 
Ans: The rate of  Evaporation increases with increase in wind speed so, Wet clothes dry faster if you keep them under a fan
3. How does water kept under the shade of a tree also gets evaporated?
Ans: Air around us gets heated from sunlight. This warm air provides heat for evaporation of water kept in the shade.
4. Why is there a need for conserving water? Give two reasons.
Ans: (i) Increasing population need more water.
(ii) Availability of water is decreasing day-by-day.
5. If you won’t drink enough water, what happens to your body? 
Ans: There will be deficiency of water in body termed as dehydration. Our body temperature increases ,skin shrink, digestion problem etc
6. You are drenched completely while playing in the rain. But you did not stop playing. To your surprise, your clothes dried after some time. How? 
Ans: Clothes dried after some time due to body heat produced while playing.
7.  In what ways does water serves to sustain life?
Ans: Water help to control biological process of our body like ingestion, transpiration, excretion etc. We use water for house hold work and agricultural work.
8. A village near a river will always get ground water where as a village which is far away will face acute water problem. Why? 
Ans: The major part of river seeps down through the soil and form Layer of ground water called Layer of water table. A village which is far away will face acute water problem as the rate of the formation of water is very slow.
I. Fill in the blanks:
 1. The process by which plants evaporate water is called _________________.
Transpiration
2. The major natural source of water is _________________.
Rain water
3. Water vapour gets added to the atmosphere by _______ and ________.
Evaporation , condensation
4. Water disappears from wet clothes by the process of _______.
Evaporation
5. The source of water below the ground such as wells, tubewells, lakes etc. is known as _______
Ground water
6. In winter mornings, ______is formed due to condensation of water vapour near the ground. 
Fog
7. Many tiny water droplets high up in the air, come together and fall down as _____________ , and ___________.
rain, hail,
8. The amount of the seepage of _____________ into the ground affects the availability of ground water.
Rain
II. Name the following:
1. Two natural sources of water.
Rain,Ground water
2. Two fresh water bodies.
Natural spring, Ground water
3. Two rainwater harvesting techniques
Storage of rainwater on surface for future use.
Recharge to ground water.
4. Four uses of water at home.
irrigation, Cooking, Drinking, as a means of Transport, as a coolant
5. The two processes through which water vapour enters the air.
Evaporation
6. Two adverse effects of floods.
Shortage of food grain, Epidemics
7. Two adverse effects of drought.
Starvation, Loss of fertility of soil
8. Two factors leading to shortage of usable water on the earth.
Drough, Flood
Links for further Study Chapter:Natural Resources-water
6th Natural Resources-water Test paper -1
Download File
6th Natural Resources-water Test paper - 2
Download File
Solved CBSE Test Paper visit link:
View/Download

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