Conservation of Plants and Animals Exercise: 1). Fill in the blanks. (a) A place where animals are protected in their natural habitat is called wild life sanctuary. (b) Species found only in a particular area is known as Endemic species. (c) Migratory birds fly to far away places because of climate changes. 2). Differentiate …
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Combustion and Flame Exercise: 1). List conditions under which combustion can take place. Ans: The conditions under which combustion can take place are as follows. i). presence of a combustible substance ii). Presence of oxygen in the air. iii). Attaining ignition temperature. 2). Fill in the blanks. (a) Burning of wood and coal causes pollution …
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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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Wastewater Story Click here for the solutions of 1). Nutrition in Plants 2). Nutrition in Animals 3). Fibre to Fabric 4). Heat 5). Acids, Bases and Salts 6). Physical and Chemical Changes 7). Weather, Climate and Adaptations of Animals to Climate 8). Winds, Storms and Cyclones 9). Soil 10). Respiration in …
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Forests Our Lifeline Click here for the solutions of 1). Nutrition in Plants 2). Nutrition in Animals 3). Fibre to Fabric 4). Heat 5). Acids, Bases and Salts 6). Physical and Chemical Changes 7). Weather, Climate and Adaptations of Animals to Climate 8). Winds, Storms and Cyclones 9). Soil 10). Respiration in …
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Water A Precious Resource Exercise 1). Mark ‘T’ if the statement is true and ‘F’ if it is false: a). The freshwater stored in the ground is much more than that present in the rivers and lakes of the world. (T/F) Ans: True. b) Water shortage is a problem faced only by people living in …
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Light 1). Fill in the blanks: (a) An image that cannot be obtained on a screen is called virtual image. (b) Image formed by a convex mirror is always virtual and smaller in size. (c) An image formed by a plane mirror is always of the same size as that of the object. (d) An image …
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Electric Current and Its Effects Exercise 1). Draw in your notebook the symbols to represent the following components of electrical circuits: connecting wires, switches in the ‘OFF’ position, bulb, cell, switch in the ‘ON’ position and battery. Ans: 2). Draw the circuit diagram to represent the circuit shown in fig. Ans: 3). Fig …
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