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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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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Weather, Climate and Adaptations of Animals to Climate Exercise: 1). Name the elements that determine the weather of a place. The elements that determine the weather of a place are temperature, humidity, rainfall during the past 24 hours and wind speed. 2). When are the maximum and minimum temperatures likely to occur …
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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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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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