Garbage In Garbage Out Exercise: 1). (a) Which kind of garbage is not converted into compost by the redworms? Ans: Garbage substances like polythene bags, plastic items, broken glass particles that are non degradable cannot be converted into compost by the redworms. (b) Have you seen any other organisms besides redworms, in your pit? If …
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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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Light, Shadows and Reflections Exercise: 1). Rearrange the boxes given below to make a sentence that helps us understand opaque objects. 2). Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous: Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, 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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