Water A Precious Resource Exercise 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) Ans: True. b) Water shortage is a problem faced only by people living in …
NCERT Solutions Std 7 Science Water A Precious Resource Read More »
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 …
NCERT Solutions Std 7 Science Light Read More »
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 …
NCERT Solutions Std 7 Science Respiration in Organisms Read More »
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 …
NCERT Solutions Std 7 Science Soil Read More »
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 …
NCERT Solutions Std 7 Science Weather, Climate and Adaptations of Animals to Climate Read More »
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 …
NCERT Solutions Std 7 Science Physical and Chemical Changes Read More »
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 …
NCERT Solutions Std 7 Science Acids, Bases and Salts Read More »
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 …
NCERT Solutions Std 7 Science Heat Read More »
Fibre To Fabric Exercise: 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? Ans: Fleece – the hairy skin of the …
NCERT Solutions Std 7 Science Fibre to Fabric Read More »
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 …
NCERT Solutions Std 7 Science Nutrition in Plants Read More »
