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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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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Respiration in Organisms Exercise: 1). Why does an athlete breathe faster and deeper than usual after finishing the race? Ans: An athlete needs more energy during and after the race. As the demand of energy is high, it needs more supply of oxygen. Therefore to fulfil the demand of oxygen an athlete breaths fast and …
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Soil Exercise: Tick the most suitable answer in questions 1 and 2. 1). In addition to the rock particles, the soil contains (i) air and water (ii) water and plants (iii) minerals, organic matter, air and water (iv) water, air and plants Ans: iii) minerals, organic matter, air and water 2). The water holding …
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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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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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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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