Lakhmir Singh Manjit Kaur Solution Class 6 Science Water Chapter 14 Exercise Solution Here.
Very Short Type Questions:
(1) Rainwater Harvesting.
(2) The main purpose of rainwater harvesting is to hold rainwater on the surface of the earth.
(3) Rainwater harvesting increase the availability of ground water.
(5) To keep the engine cool.
(6) 1 kilogram of rice.
(7) The five sources of water are rain water, river water, sea water, sea water, ocean water.
(9) Sea water is saline water.
(11) Rain water.
(12) Sea and Ocean is the sources of saline water.
(13) (a) F (b) T (c) F (d) F (e) F (f) T.
(17) Evaporation and Transpiration.
(19) (a) solid state of water- Snow. (b) gaseous state of water- Water vapour.
(20) (a) condensation (b) condensation.
(22) When heavy rains occurs the animals living in soils are dead because they do not get air to breathe as the all the soil is covered with flood water.
(24) The loss of water by the leaved of plant is called transpiration.
(25) (a) Two Third
(b) Heating or Cooling.
(e) Water cycle.
Short Answer Type Questions:
(26) The two main techniques of rainwater harvesting are:-
(i) collection and storage of rainwater in tanks for future use when there is scarcity of water.
(ii) To make rainwater percolate into the ground more efficiently by constructing percolation pits and recharge wells so as to recharge groundwater.
(27) If we want to dry our washed and wet school uniform quickly, we should spread it near a heater or an angithi because the heat produce by it will evaporate the water present in wet clothes at a faster rate due to which the uniform will get dry quickly.
(28) This is because, When water present in air around the bottle comes in contact with cold outer surface of bottle, it gets cooled and conde3nses to form liquid water which then forms a puddle of water around the bottle.
(29) The spectacles glasses become wet because the water vapor present in our breathe condenses on the glasses to form tiny droplets of water.
(30) This is because, the formation of dew due to the condensation of water vapour present in air.
(31) This is because, The air around the glass contains water vapor in it. When the water vapor present in air come in contact with cold, outside surface of glass, they get cooled and con dense to form tiny drops of liquid water.
(32) (a) which is present in air- gaseous.
(b) which is taken out from a freezer of a refrigerator- Solid.
(c) which flows from a tap- Liquid.
(33) The seeds of various plants and trees located near the banks of rivers and sea shores fall on the water of rivers and the sea. These seeds float on water and carried away to far away places. When these seeds reach the land, they germinate to produce plants and trees in that area. In this way several varieties of plants and trees spread from one place to another.
(34) The importance of water cycle in nature are:
(i) Water cycle makes fresh water available in the form of rain.
(ii) Water cycle keeps the amount of water on the earths surface constant.
(35) The sources of groundwater are as follows:
Rivers, ponds, lakes, sea, ocean.
The 5 uses of water:
(a) Water is used in homes for drinking, cooking food, washing utensils, cleaning floor, brushing teeth, washing clothes, watering plants.
(b) Water is used in agriculture for growing food.
(c) Water is used in industries for producing almost all the things that we use.
(d) Water is used to keep things cool.
(e) Water is used to generate electricity.
(36) Human beings need water for drinking, cooking food, washing utensils, cleaning floor, brushing teeth, washing clothes, watering plants.
Being highly saline ocean water or sea water is not fit for drinking, other domestic purposes, agriculture or industrial needs.
(37) The three states of matter are solid. Liquid and gas.
The most of water on the earth located at ocean.
Being highly saline ocean water or sea water can not be used directly.
(38) The mass of tiny droplets formed by the condensation of water vapour which we see floating high in the atmosphere is called a cloud. The formation of clouds involves the process of condensation.
(39) (a) Evaporation:- The changing of water into water vapour is called evaporation.
(b) Condensation:- The changing of water vapour into liquid water on cooling is called condensation.
Long answer Type Questions:
(40) The continuous circulation of water from the earth’s surface to atmosphere back to earth, is called water cycle in nature.
Importance of Water Cycle in Nature:
(a) Water cycle makes fresh water available in the form of rain.
(b) Water cycle keeps the amount of water on the earth’s surface constant.
(41) Rain is useful in various ways i.e.
(a) rains bring relief by cooling the environment after hot summer days.
(b) Rains provide water in the rivers and dams of hydroelectric power supply.
(c) Rains are also responsible for the groundwater which gets stored under the surface of earth.
What happens if the rain for a long time
(i) Heavy rains in the city areas lead to waterlogged roads and streets. This disrupts the traffic on roads and causes inconvenience to the people.
(ii) The animals living in water are carried away by the fast flowing flood waters. These water animals often get trapped on land areas and when the flood water recedes.
(iii) Heavy rains also kill the animals living in soil because such animal do not get air to breathe when all the soil gets covered with flood water.
There are various types of damage can occur for heavily rains like: damage to property, human life, domestic animals, standing crops, wild animals of the forest and so on.
(42) Conserve water means to save water by using it carefully, wisely and by preventing its wastage.
The various ways to conserve water are as follows:
(i) Turn off tap immediately after use.
(ii) Take bath by filling water in bucket and not directly under the flowing tap.
(iii) Wash the utensils by filling water in basin and not under the running tap.
(iv) Do not use a full flush from the cistern in the toilet when a half flush is sufficient.
(43) The activity of collecting rainwater directly and store it in a big tanks for later use, or making the rainwater percolate into ground more efficiently to recharge the ground water is called rainwater harvesting.
Rainwater Harvesting with the help of lebelled sketch:
Page No. 224.
(44) Heavy rains lead to too much rise in the level of water in rivers. The river water starts overflowing from its banks and spreads over a large area of land causing floods.
The various type of damage including property, human life, domestic animals, standing crops, and wild animals of the forest caused by floods.
The animals living in water normally effected by floods as they are carried away by the fast flowing flood waters. These water animals often get trapped on land areas and when the flood water recedes they die.
(45) It does not rain in region for a long time is called draught.
The lack of rains for a long time may cause draught.
The problem faced by peoples living in draught areas are following:
(i) Draught leads to severe shortage of food as in draught condition the soil does not have sufficient moisture to grow crops well.
(ii) The shortage of food for domestic animals i.e. cows , buffaloes also occur as the grass can’t grow for the shortage of water in soil.
(iii) Some people and domestic also die due to the reason of starvation.