Exercises 1. Fill the missing word in the blank spaces in the following statements: (a) Wind is __________ air. (b) Winds are generated due to __________ heating on the earth. (c) Near the earth’s surface __________air rises up whereas ___________ air comes down. (d) Air moves from a region of __________ pressure to a region … Read more

Exercises 1. Name the elements that determine the weather of a place. Answer. The elements that determine the weather of a place are: (i) Temperature (ii) Humidity (iii) Rainfall (iv) Wind speed 2. When are the maximum and minimum temperatures likely to occur during the day? Answer. The maximum temperature during the day occurs at … Read more

Exercises 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 Answer (a) Photosynthesis → Chemical change (b) Dissolving sugar in water → Physical change … Read more

Exercises 1. State differences between acids and bases. Answer S.No. Acids Bases 1. Acids are sour in taste. Bases are bitter in taste. 2. It turns litmus paper red. It turns litmus paper blue. 3. It doesn’t change the colour of turmeric indicator. It changes the colour of turmeric indicator to red. 4. It doesn’t … Read more

 Exercises 1. State similarities and differences between the laboratory thermometer and the clinical thermometer. Answer Similarities Differences (i) both made up of uniform glass tube. (ii) both contain mercury. (iii) both have bulb at one end. (iv) both generally have celcius scale. (i) Range of laboratory thermometer is from -10°C to 110°C while range of clinical … Read more

Exercises 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? (b) What is meant by the white fleece of the lamb? … Read more

Exercises Q1: Fill in the blanks: (a) The main steps of nutrition in humans are __________, __________, __________, _________ and __________. (b) The largest gland in the human body is __________. (c) The stomach releases hydrochloric acid and ___________ juices which act on food. (d) The inner wall of the small intestine has many finger-like … Read more

Excercise Q 1. Why do organisms need to take food? Ans: All organisms need to take food to get energy for the growth, development and maintenance of their bodies. The life process include nutrition, respiration, growth, excretion, reproduction and response to stimuli which can only be done by intake of food. Q 2. Distinguish between … Read more

Exercises 1. Mark ‘T’ if the statement is true and ‘F’ if it is false: (a) The freshwater stored in the ground is much more than that present in the rivers and lakes of the world. (T/F) (b) Water shortage is a problem faced only by people living in rural areas. (T/F) (c) Water from … Read more