Exercises 1. Draw in your notebook the symbols to represent the following components of electrical circuits: connecting wires, switch in the ‘OFF’ position, bulb, cell, switch in the ‘ON’ position, and battery. Answer.  2. Draw the circuit diagram to represent the circuit shown in Fig.14.21. Answer.  3. Fig.14.22 shows four cells fixed on a board. Draw lines … Read more

Exercises 1.Fill in the blanks: (a) Cleaning of water is a process of removing ____________. (b) Wastewater released by houses is called ____________. (c) Dried ____________ is used as manure. (d) Drains get blocked by ____________ and ____________. Answer. (a) Cleaning of water is a process of removing pollutant. (b) Wastewater released by houses is … Read more

Exercises 1. Explain how animals dwelling in the forest help it grow and regenerate. Answer. Various types of animals (herbivores, carnivores, omnivores) live in forests and contribute to food chain. Following activities show how animals help forest grow and regenerate. (i) Herbivores animals clear the land by eating grass for the new growth of vegetation. (ii) … Read more

Exercises 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 … Read more

Exercises 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 the hammer … Read more

Exercises 1. Fill in the blanks: (a) Production of new individuals from the vegetative part of parent is called _____________. (b) A flower may have either male or female reproductive parts. Such a flower is called_____________. (c) The transfer of pollen grains from the anther to the stigma of the same or of another flower … Read more

Exercises 1. Match structures given in Column I with functions given in Column II. Column I Column II (i) Stomata (a) Absorption of water (ii) Xylem (b) Transpiration (iii) Root hairs (c) Transport of food (iv) Phloem (d) Transport of water   (e) Synthesis of carbohydrates Answer. Column I Column II (i) Stomata (b) Transpiration … Read more

Exercises 1. Why does an athlete breathe faster and deeper than usual after finishing the race? Answer. When the athlete runs in the race, his body needs more energy. In order to get extra energy, the athlete breathes faster. Because more oxygen is supplied to our cells. It speeds up the breakdown of food and … Read more

Exercises 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 Answer. (iii) minerals, organic matter, air and water 2. The water holding capacity … Read more