Science 'N' us-3 final - School Books Publishers India

come? Yes, from the soil itself. This experiment shows that soilcontains moisture.5. Which type of soil is most useful for the growth of plants?Ans. Loamy soil is most useful for the growth of plants. It has a lot of humus.Humus makes the soil fertile. It becomes even more beneficial whenadequate amount of fertilizers are added to it.6. Which layer of the soil is hardest of all?Ans. The lower layer of the soil is the hardest layer. It is made up of hardrocks. This layer is called bedrock.B. Choose the correct word from side box and fill in the blanks :1. Roots of the trees break rock into small pieces. desert2. Humus increases the fertility of the soil. bedrock3. Sandy soil is found in desert areas. humus4. Soil is formed due to breaking of rocks. rocks5. Lowest layer of soil is called bedrock. breakingC. Write :1. Any three constituents of soil : (a) gravel (b) sand (c) clay2. Any three types of soil : (a) sandy (b) clayey (c) loamy3. Any three layers of soil : (a) top-soil (b) sub-soil (c) bedrockD. Write True or False against the following statements :1. Soil is hard and is of no use. False2. Soil has moisture in it. True3. Clayey soil is very useful for agriculture. False4. Soil contains humus. True5. There is no difference in size and colour between the particlesof two different soils.FalseFlowchartFill up the boxes to complete the flowcharts :(a)Composition of Soilgravelclaysand humus moistureair(b)Types of Soil(c)Layers of Soilclayeysandyloamytop-soilsub-soilbedrockLet us EnjoyEnjoy to draw a neat labelled diagram showing layers of soil in your notebook.Ans. Do yourself.Fun Time ActivityTake some clayey soil. Mix it with water and make various toys for yourself.Ans. Do yourself.Horizon Press54Science 'n' Us - 1 to 5