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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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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Winds, Storms and Cyclones Exercise: 1). Fill the missing word in the blank spaces in the following statements: (a) Wind is moving air. (b) Winds are generated due to uneven heating on the earth. (c) Near the earth’s surface warm air rises up whereas comparatively cooler air comes down. (d) Air moves from a region of …
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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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Physical and Chemical Changes Exercise: 1). Classify the changes involved in the following processes as physical or chemical changes: (a) Photosynthesis (b) Dissolving sugar in water (c) Burning of coal (d) Melting of wax (e) Beating aluminium to make aluminium foil (f ) Digestion of food Physical Changes Chemical Changes Dissolving sugar in water …
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Acids, Bases and Salts Exercise: 1). State differences between acids and bases. Acids Bases 1. Acids are substances that contain hydrogen ion. 1. Bases are substances that contain hydroxyl ion. 2. Acid turns blue litmus red. 2. Base turns red litmus blue. 3. Acids are sour to taste. 3. Bases are bitter …
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