Class 5th Science Ch 1

 







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Class 6th Science written work Ch 16 Garbage in Garbage out

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  Exercise Questions 1. (a) Which kind of garbage is not converted into compost by the red worms? (b) Have you seen any other organism besides red worms, in your pit? If yes, try to find out their names. Draw pictures of these. Solution: a) P ieces of cloth, polythene bags, broken glass, aluminium wrappers, nails and broken toys are  not converted into compost by the red worms. b) Earthworms, small insects like ant, millipedes are found in pits. 2. Discuss: (a) Is garbage disposal the responsibility only of the government? (b) Is it possible to reduce the problems relating to disposal of garbage? Solution: a) No, not just the government, but everybody is responsible for garbage disposal. We should bifurcate wet and dry waste, recycle the non-biodegradable substances and we should also reduce the accumulation of garbage in our house and streets. b) Yes, it is possible to reduce the problems of garbage by scientific disposal of garbage, we can do it by bifurcation of different w...
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Class 6th Science written work Ch 15 Air Around Us

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Class 9th Science Revision Notes Ch 1 Matter in Our Surrounding

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  Revision Notes on Matter in Our Surroundings What is Matter? Air, water, stones, sand, clouds, pencils, books – Everything is made up of matter. Matter is everything in this universe that occupies space and has mass. Constituents of Matter According to the early Indian philosophers, every living and non-living thing is made of five basic elements called the  Panchtatava  –  Air ,  Water ,  Earth ,  Sky ,  and Fire . Therefore, matter is a composition of these five constituents. Physical Nature of Matter Is matter continuous or particulate? Matter is particulate in nature. This means that matter consists of particles as you can see in the microscopic image of a cube above.  For Example , If we put a drop of red color in water the color of the water turns red. This happens because the particles of red color mix with the particles of water. What is the size of these particles?   The size of the particles of matter is very small. They can ...
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