Coal And petroleum Exercise: 1). What are the advantages of using CNG and LPG as fuels? Ans: The advantages of using CNG and LPG as fuels are as follows i). They are less polluting. ii). They are cleaner fuels. iii). they can be used directly for burning. iv). Their cost is low. 2). Name the …
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Microorganisms: Friend and Foe Exercise: 1). Fill in the blanks. (a) Microorganisms can be seen with the help of a microscope. (b) Blue-green algae fix nitrogen directly from air and enhance fertility of soil. (c) Alcohol is produced with the help of yeast. (d) Cholera is caused by bacteria. 2). Tick the correct answer. …
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Crop Production and Management Exercise: 1). Select the correct word from the following list and fill in the blanks. (float, water, crop, nutrients, preparation) (a) The same kind of plants grown and cultivated on a large scale at a place is called crop. (b) The first step before growing crops is preparation of the soil. …
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