Exercise : Solutions of Questions on Page Number : 32 NCERT Solutions for Class 7 Science Chapter 3 – Fibre to Fabric Q1 : 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? Answer : (a) Wool is obtained from the hairy fibres (hair) of the sheep. (b) White fleece of the lamb refers to the…
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Exercise : Solutions of Questions on Page Number : 20 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 outgrowths called __________. (e) Amoeba digests its food in the __________. Answer : a) The main steps of nutrition in humans are __ingestion__, __digestion__, __absorption__, __assimilation__ and __egestion__. (b) The largest gland in the human…
Exercise : Solutions of Questions on Page Number : 9 Q1 : Why do organisms need to take food? Answer : All living organisms require food to survive. It gives them energy to perform various activities. All activities such as playing, running, walking, studying, etc. require energy. The various components present in our food such as carbohydrates, proteins, fats, vitamins, and minerals provide energy to our body. These are also important for growth and development of the body. Q2 : Distinguish between a parasite and a saprotroph. Answer : Parasite Saprotroph The organism that grows on the body of…
QUESTION 1: A-Which type of garbage do red worms cannot transform into compost? B-Which are the organisms other than red worms help in composting? SOLUTION: A- Plastic bags, broken glass, aluminium wrappers and plastic items are the types of garbage which cannot be converted into compost by red worms. B- Bacteria and saprophytic organisms like moulds help in composting. QUESTION 2: A- Should the government be the only one held responsible for garbage disposal? B-How can the problems arising from garbage disposal be reduced? SOLUTION: A- It is the duty of every citizen in the country to help in proper…
Q1:Mention the composition of air. Ans: Air is a mixture of oxygen, nitrogen, water vapor, carbon dioxide and also a few other gasses. Air also constitutes some dust particles. Q2:Which gas in the atmosphere is very essential for respiration in animals? Ans: Oxygen. Q3:Does air support burning? If yes. How can you show that by an experiment? Ans: Take a small candle and light it. Cover the burning candle using a glass jar. After a few minutes, the burning candle will be extinguished. This happens because the supply of air for the burning process stopped due to a glass jar…
Q1:Fill in the blanks for the following: (a) The process by which the water is converted to water vapour is called _______. (b) The process by which water vapor is converted into water is known as _______. (c) If there is no rainfall in a region for a year or two, it may lead to ________ in that region. (d) Huge amount of rainfall results in _______. Ans. (a) evaporation or vaporization (b) condensation (c) drought (d) flood Q2:Determine whether the following phenomena is caused due to evaporation or condensation: (a) Water drops are formed on the outer surface of…
Q1:Fill the blanks: (i) The shapes in which artificial magnets can be made are _______, _______ and _______. (ii) _______ materials are attracted towards magnet. (iii)Paper is not _______. (iv) A few centuries ago, sailors used a suspended piece of _______ to find direction. (v) There are bound to be ________ poles in a magnet. KEY (i) horse-shoe, bar, cylindrical. (ii) magnetic materials. (iii) magnetic (iv) bar magnet or lode stone (v) a pair or two Q2:True or False (i) There is only one pole in a cylindrical magnet. (ii) The natural magnets were first discovered in Greece. (iii) In…
Q1. Complete the sentence: (a) A device, which can break an electric circuit, is called as (b) There are ______ terminals in an electric cell. Ans. (a) Switch (b) two Q2. Mark ‘True’ or ‘False’ for the following statements: (a) Electric current can pass through a sheet of thermocol. (b) Electric current can flow through metals. (c) Instead of metal wires, a jute string can be used to make a circuit. Ans. (a) True (b) False (c) False. Q3. Why do we use an electric switch? Name some electrical gadgets, which have switches in them. Ans. Electric switches are used…
Q1. Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous: Air, water, a piece of rock, a sheet of aluminium, a wooden board, a sheet of polythene, a sheet of cellophane, a CD, smoke, a sheet of plane glass, fog, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall the fame of a gas burner, a sheet of cardboard, a lighted torch, a wire mesh, a mirror, kerosene stove, sun, firefly, moon, a sheet of carbon paper. Ans: Object Opaque/Transparent/Translucent Luminous/Non Luminous Moon Opaque Non-Luminous Firefly Opaque Luminous…
Q1. Give 2 examples of water, land and air modes of transport Answer: Water – Boats and ships Land – Cars, Bikes and trucks Air – Helicopters and airplanes Q2. Fill in the blanks (a) One meter is _____ cm. (b) 5 kilometres is ______ m. (c) Motion of wheel in bicycle is ____________. (d) Motion of a kid in a swing is ___________. (e) Motion of needle in a sewing machine is __________. Answer: (a) 100 (b) 5000 (c) Circular (d) Periodic Oscillatory (e) Periodic Oscillatory Q3. Why can’t a pace or footstep be used as a standard unit…