CBSE Science Class 7
Water A Precious Resource
Water A Precious Resource - Chapter Wise CBSE Solved Question and Answer Based On NCERT
Very Short Q&A:
Q1: Name the available water resource on earth.
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Ans:
Oceans, seas, lakes, rivers, ice, ground water and moisture in the air.
Q2: Water that is fit for human consumption is called_________________.
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Q3: What per cent of total water on the earth is actually available for our use?
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Q4: As a solid, water exists as icecaps at the poles. True/ False.
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Q5: People obtain ---------through tube wells and hand pumps.
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Q6: Three forms of water are solid, liquid and ---------.
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Q7: The water bearing layer of the earth is ----------.
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Q8: The process of water seepage into the ground is called ---------.
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Q9: The process of changing of water into its vapour is called---------.
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Q10: The process of changing water vapour into water is called ---------.
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Q11: No rainfall for a year or more may lead to ---------- in that region.
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Q12: Excessive rains may cause -----------.
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Q13: What are main sources of water?
- Rainwater
- Glaciers, ice
- River water
- sea and Ocean water
- All of the above
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Q14: Why ice floats on water?
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Ans:
Ice is lighter than water so floats on water.
Q15: Name the gaseous form of water around us.
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Ans:
Water vapour present in the air around us.
Q16: Sometimes, ground water accumulates between layers of hard rock. This is known as an aquifer. True/False
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Q17: Plants use ground water and release it in the form of water vapour during transpiration. True/False
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Q18: Clouds then release the water through ___________________.
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Q19: Is increasing population is the reason for depletion of water table?
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Q20: What is water management?
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Ans:
Water management is the continuous matching of water resources with the water requirements of a place.
Q21: What do you mean by water harvesting?
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Ans:
Instead of letting rainwater run -off into the sea, it can be used to recharge ground water. This is known as rainwater harvesting.
Q22: State the advantage of water harvesting?
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Ans:
Rainwater harvesting can be used to raise the water table in arid areas.
Q23: What is drip irrigation?
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Ans:
Drip irrigation is an economical way of using water.
Q24: State the use of water in plants.
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Ans:
Plants need water to absorb nutrients from the soil and make their food.
Q25: Which day is celebrated as World’s Water Day?
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Q26: Name the process responsible for maintenance of water on earth.
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Q27: Name the region in Gujarat having very eratic rainfall.
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Ans:
Bhujpur in the Kutch area of Gujarat
Q28: Define infiltration.
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Ans:
Infiltration is the process of seeping of water into the ground.
Q29: What is aquifer?
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Ans:
An aquifer is a body of saturated rock through which water can easily move.
Q30: Which of the following is the reason for depletion of water table?
- Increasing population
- Increasing industries
- Deforestation
- All of the above
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Q31: How water in an aquifer can be pumped out?
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Ans:
With the help of tube wells or hand pumps.
Q32: How does underground water gets replenished?
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Ans:
By seepage of rainwater.
Q33: State factors affecting water table.
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Ans:
Increasing population, increasing industries, increasing agricultural activities and scanty rainfall.
