Air Around Us Exercise: 1). What is the composition of air? Ans: Air is a mixture of nitrogen, oxygen, carbon dioxide, water vapour, dust particles and a few other gases. 2). Which gas in the atmosphere is essential for respiration? Ans: Oxygen in the atmosphere is essential for respiration. 3). How will you prove that …
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Water Exercise: 1). Fill up the blanks in the following: (a) The process of changing of water into its vapour is called evaporation. (b) The process of changing water vapour into water is called condensation. (c) No rainfall for a year or more may lead to droughts in that region. (d) Excessive rains may cause …
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Fun With Magnets Exercise: 1). Fill in the blanks in the following. (i) Artificial magnets are made in different shapes such as bar magnet, disc magnet and horse-shoe magnet. (ii) The Materials which are attracted towards a magnet are called magnetic materials. (iii) Paper is not a magnetic material. (iv) In the olden days, sailors …
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Electricity and Circuits Exercise: 1. Fill in the blanks : (a) A device that is used to break an electric circuit is called a switch. (b) An electric cell has two terminals. 2. Mark ‘True’ or ‘False’ for the following statements: (a) Electric current can flow through metals. True (b) Instead of metal wires, a …
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Motion and Measurement of Distances Exercise: 1). Give two examples each, of modes of transport used on land, water and air. Modes of transport on land: bus, train, truck, car. etc. Modes of transport on water: boat, ship, steamer. etc. Modes of transport on air: aeroplane, helicopter. etc. 2). Fill in the blanks: (i). One …
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The Living Organisms Characteristics and Habitats Exercise: 1). What is a habitat? The place where an organism lives is called a habitat. 2). How are cactus adapted to survive in a desert? (i) the leaves of the cactus are in the form of spines to avoid loss of water through transpiration. …
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Body Movements Exercise: 1). Fill in the blanks. a). Joints of the bones help in the movement of the body. b). A combination of bones and cartilages forms the skeleton of the body. c). The bones at the elbow are joined by a hinge joint. d). The contraction of the muscles pulls the bones during …
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Getting to Know Plants Exercise: 1). Correct the following statements and rewrite them in your notebook. a). Stem absorbs water and minerals from the soil. Root absorbs water and minerals from the soil. b). Leaves hold the plant upright. Root hold the plant upright. c). Roots conduct water to the leaves. …
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Changes Around Us Exercise: 1). To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed? Yes, this change can be reversed. 2). You accidentally dropped your favorite toy and broke it. This is a change you did not want. Can …
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Fibre to Fabric Exercise: 1). Classify the following fibres as natural or synthetic: nylon, wool, cotton, silk, polyester, jute Natural fibre Synthetic fibre Wool Cotton Silk jute Nylon polyester 2). State whether the following statements are true or false: a). yarn is made from fibres. True. b). sinning is a process …
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