Students, after getting some new and interesting facts about science in every chapter, now we will turn to the next chapter that is LIFE ON EARTH “Water”.
Water seems to be very common word in our day to day life. Lets start this chapter with some basic questions.
Questions and answers :
1.) What is water ?
Answer :- Water is the substance needed for drinking, called as life on earth.
2.) What are the sources of water ?
Answer :- Lake, ponds, river, wells.
3.) What are the uses of water ?
Answer :- Water is used for household, industry and agriculture.
4.) Can you drink sea water ?
Answer :- No, sea water contains salt.
Water and it’s uses
Question and answers :
1.) Do you know what is formula for water ?
Answer :-Yes, H2O.
2.) What is mean by Universal solvent ?
Answer :- In water any thing can get dissolved, so called as Universal solvent.
3.) How many percentage of earth covered with water ?
Answer :- 71 %
4.) How many percentage of water on earth is fit to drink ?
Answer :- Only 0.5% of water is drinkable.
5.) What are the characteristics of water ?
Answer :- Water is tasteless, odorless and colorless.
Water is the basic need of every living organisms. It is tasteless, odorless and colorless. Water is very important part in our day to day life, at the same time scientifically water is called as Universal solvent. The Universal solvent means within water any thing or substance can get dissolve. Let’s take very common example that salt or sugar can be easily dissolved in water. The chemical formula of water is H2O.
71 % of Earth’s surface is covered with water. But only 0.5% of water on earth is fit to drink. Because humans cannot drink sea water as it contains salt.
Uses of water
Lets have a look on uses of water.
- Water is used by every living organisms for the drinking. Daily 5 liters of water is needed to every human.
- Water has various household uses like washing, house cleaning, for making food in kitchen, flushing toilet, for bath, for garden, cleaning the utensils etc.
- The agriculture is completely depend on water, for giving pesticides, for the purpose of irrigation.
- Water have much importance in various industries also for washing, cooling, making product.
- Mainly, water is used to produce electricity.
- Various sources of water present on earth such as river, lake, ponds, wells, tube-wells. This water we get from the tab in our house.