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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Heat Exercise: 1). State similarities and differences between the laboratory thermometer and the clinical thermometer. Similarities: i). both consists of long, narrow, uniform glass tube. ii). both have mercury in the bulb. iii). both has Celsius scale on the glass tube Differences: Laboratory thermometer Clinical thermometer 1. The laboratory thermometer is designed to measure …
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Fibre To Fabric Exercise: 1). You must be familiar with the following nursery rhymes: (i) ‘Baa baa black sheep, have you any wool.’ (ii) ‘Mary had a little lamb, whose fleece was white as snow.’ Answer the following: (a) Which parts of the black sheep have wool? Ans: Fleece – the hairy skin of the …
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Nutrition in Animals Exercise: 1). Fill in the blanks: (a) The main steps of nutrition in humans are ingestion, digestion, absorption, assimilation and egestion. (b) The largest gland in the human body is the liver. (c) The stomach releases hydrochloric acid and digestive juices which act on food. (d) The inner wall of the small …
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Nutrition in Plants Exercise: 1). Why do organisms take food? Organisms need food for growth and development. Food also provides energy. 2). Distinguish between a parasite and a saprotroph. Parasite Saprotroph 1. A parasite is an organism that takes the food from the living thing on which it survives. 1. An organism that …
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Too Much Water, Too Little Water Questions with the (*) sign are open-ended questions. Page 147 Discuss How can unclean or dirty water harm our body? Unclean or dirty water contains germs that can many diseases to our body. Have you ever got dirty or unclean water in your area? …
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Nandita in Mumbai Questions with the (*) sign are open-ended questions. Page 139 Why did Nandita have to bring her mother from the village to Mumbai? Nandita brought her mother from the village to Mumbai for her treatment. Nandita used to feel like vomiting when at first, she had to …
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A Busy Month Questions with (*) sign are open-ended questions. Page 130 How many years ago did Gijubhai write this letter? The letter had been written 85 years ago. Find out how old your grandfather and grandmother were at that time. My grandparents have not …
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From Market To Home Questions with (*) sign are open-ended questions. Page 120 Does anyone in your house have to get up very early? What time does he or she get up? Why do they need to get up so early? My parents get up early in the morning. …
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