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WATER: A PRECIOUS RESOURCE Q.5.  What are the sources of groundwater for human consumption?  Ans. The rainwater and water from other sources such as rivers and ponds seeps through the soil and fills the empty spaces and cracks deep below the ground. The groundwater thus gets recharged by this process. Q.6. Differentiate between groundwater and water table.  Ground water Water table Ground water comes from the natural seeping, also called percolation of different forms of precipitation and other surface waters down through the earth’s soil. The upper level of the ground water is called the water table. It is a broader source which contains all water table, aquifer etc. Water table is a part of ground water. Q.7. Name the factors which are responsible for depletion of water table  Ans. The factors which are responsible for depletion of water table are: Increase in population, industrial and agricultural

 WATER: A PRECIOUS RESOURCE Q.1.  Fill the blanks:  a) The process of seeping water into the ground is called ______________ . b) The seeped water is collected between the layer of hard rock. This is called  ______________. c) Sources of drinking water in India are  ______ _and  ______________. d)   Every year,  ______________  is celebrated as World Water Day.  e) Rain, hail and snow that fall on ground are termed as  ______________. f) Constant circulation of water on the earth is known as  ______________. g) The hand pumps and  ______________  are inserted at aquifer to get water.  Ans. a)  infiltration           b)  aquifer           c)  rivers, l akes           d) 22 March             e)   Precipitation           f)  water cycle .           g)  tube wells Q.2. Multiple choice questions: i) Nearly 71% of earth's surface is covered with:  a) Air  b) Water . c) Soil  d) Ice Ans. b) water  ii) Where is maximum salinity in water found?  a) Sea  b

 Body movements Q.5. Write a short note on cartilage. Ans.  Cartilage : Cartilage is a kind of softer and elastic bone which can be bent and are not as hard as the bones. Cartilage is found in some elastic organs; like Upper part of ear has cartilage, nose etc. Cartilage is also found in the joints of the body and layer of cartilage reduces friction, hence allows the bones to move easily over each other without damaging them. Q.6. Muscles work in pairs. Explain. Ans.  Muscle is a fibrous tissue in the body that has ability to contract and relax. Muscles are attached to do so by the brain. The muscle bulges due to contraction (it became smaller in length). When contracted, the muscle becomes shorter, stiffer and thicker. It pulls the bone. Muscles work in pairs. When one of them contracts, the bone is pulled in that direction. The other muscle of the pair relaxes. To move the bone in the opposite direction, the relaxed muscle contracts to pull the bone towards its original position, w

    Weather ,  Climate and Adaptations of Animals to Climate Q.10.  Explain climatic conditions of Polar Regions. Ans. The Polar Regions present an extreme climate. These regions are covered with snow and it is very cold for most part of the year. For six months the sun does not set at the poles while for the other six months the sun does not rise. In winters, the temperature can be as low as –37°C. Q.11.  Tropical region generally has a hot climate. Why? Ans. The tropical region has generally a hot climate because of its location around the equator. Even in the coldest month the temperature is generally higher than about 15°C. During hot summers, the temperature may cross 40°C. Days and nights are almost equal in length throughout the year. These regions get plenty of rainfall. Q.12.  Tropical region generally has a large population of animals. Why? Ans. An important feature of this region is the tropical rainforests. because of the continuous warmth and rain, this region s

  Weather ,  Climate and Adaptations of Animals to Climate Q.1. Which department of the Government prepares the weather reports. Ans. The weather reports are prepared by the Meteorological Department of the Government. This department collects data on temperature, wind, etc., and makes the weather prediction. Q.2. Differentiate between weather and climate. Ans.  Weather Climate It is the day to day condition of the atmosphere at a place at a particular time. It is the average weather pattern taken over a long period of time. It can vary over very short periods of time. It does not vary in short periods.   It cannot force adaptations in the organisms. It forces adaptations in the organisms.   Q.3.  Define: a) Weather b)Humidity Ans. a)  It is the day to day condition of the atmosphere at a place at a particular time.           b)  Humidity is the concentration of water

          Getting to know plants  Q.17. What are the functions of root? Ans. T he functions of root are: •     The roots help in holding the plant firmly in the soil. They are said to anchor the plant to the soil. •      Absorption of water and minerals from the soil. •      Help to bind soil particles together. •     Sometimes roots are modified to perform additional functions like reproduction, nutrition etc.   Q.18. What are tap roots? Draw a sketch of tap roots. Ans. Characteristics of tap roots : •        In the tap root system, a single straight tapering root  (called the primary root)   grows vertically down into the soil and give out branches on all sides. Tap roots are also called true roots. •       Later smaller roots called lateral roots branch out from this primary root. •       Mango, neem, pine, sheesham, pea, carrot, radish, turnip, and beetroot plants have taproot.          Q.19. What are fibrous roots? Draw a sketch of fibrous roots. Ans.  Characteristi