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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Motion and Time Exercise 1). Classify the following as motion along a straight line, circular or oscillatory motion: (i) Motion of your hands while running. (ii) Motion of a horse pulling a cart on a straight road. (iii) Motion of a child in a merry-go-round. (iv) Motion of a child on a see-saw. (v) Motion of …
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Reproduction in Plants Exercise: 1). Fill in the blanks. (a) Production of new individuals from the vegetative part of parent is called vegetative propagation. (b) A flower may have either male or female reproductive parts. Such a flower is called a unisexual flower. (c) The transfer of pollen grains from the anther to the stigma …
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Transportation in Animals and Plants Exercise: 1). Match structures given in Column I with functions given in Column II. Column I Column II (i) Stomata (a) Absorption of water (ii) Xylem (b) Transpiration (iii) Root hairs (c) Transport of food (iv) Phloem (d) Transport of water …
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