Exercises Fill in the blanks: (a) Cleaning of water is a process of removing pollutants. (b) Wastewater released by houses is called sewage. (c) Dried sludge is used as manure. (d) Drains get blocked by oils and fats. Short Answer Questions: What is sewage? Explain why it is harmful to discharge untreated sewage into rivers […]
Exercises Explain how animals dwelling in the forest help it grow and regenerate. Animals help in the dispersal of seeds through their droppings. Decomposers like fungi and insects break down dead plants and animals into humus, which enriches the soil. Carnivores control the herbivore population, maintaining ecological balance. Explain how forests prevent floods. Forests act […]
Q.1.Fill in the blanks: (a) An image that cannot be obtained on a screen is called ___________ . (b) Image formed by a convex is __________ always virtual and smaller in size. (c) An image formed by a __________ mirror is always of the same size as that of the object. (d) An image which […]
1. Draw the symbols to represent the following components of electrical circuits: Connecting wires: A straight line. Switch in the ‘OFF’ position: A break in the line with an open gap. Bulb: A circle with a cross inside (representing the filament). Cell: A long line (positive terminal) and a short line (negative terminal). Switch in […]
Exercise Questions and Answers on Motion and Time 1. Classify the following as motion along a straight line, circular or oscillatory motion: (i) Motion of your hands while running Answer: Straight line motion (ii) Motion of a horse pulling a cart on a straight road Answer: Straight line motion (iii) Motion of a child in […]
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 unisexual. (c) The transfer of pollen grains from the anther to the stigma of the same or of another […]
Answers to Exercises 1. Match structures given in Column I with functions given in Column II. Column I Column II (i) Stomata (b) Transpiration (ii) Xylem (d) Transport of water (iii) Root hairs (a) Absorption of water (iv) Phloem (c) Transport of food 2. Fill in the blanks. (i) Haemoglobin is present in red blood […]
Questions and Answers on Respiration in Organisms 1. Why does an athlete breathe faster and deeper than usual after finishing a race? Answer: An athlete breathes faster and deeper to supply more oxygen to the muscles and remove the extra carbon dioxide produced during exercise. 2. List the similarities and differences between aerobic and anaerobic […]
Exercise Questions and Answers 1. Classify the changes involved in the following processes as physical or chemical changes: (a) Photosynthesis – Chemical change (b) Dissolving sugar in water – Physical change (c) Burning of coal – Chemical change (d) Melting of wax – Physical change (e) Digestion of food – Chemical change (f) Beating aluminium […]
Exercises 1. State differences between acids and bases. Answer: Acids: Taste sour, turn blue litmus red, and are found in substances like lemon juice and vinegar. Bases: Taste bitter, feel soapy, turn red litmus blue, and are found in substances like soap and baking soda. 2. Ammonia is found in many household products, such as […]