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Class 9th Science Ch 2 Revision Notes on Is matter around us Pure

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  Revision Notes on Is matter around us Pure What is a substance? Anything that cannot be broken into further particles by applying any physical processes is called a  Substance . Matter can be classified into two types of substances – Pure substances and Mixtures What is a pure substance? A substance that consists of only one type of particle is called a  Pure Substance .  For Example , Diamond, Salt, Sulfur, Tin.  What is a mixture? When we combine different substances into each other a mixture is formed.  For Example , Lemonade is a mixture of three substances, Lemon Juice, Sugar and Water. Which of these is a mixture or a pure substance? Water, Copper, Chocolate cake, Hydrogen, Soil, Air Mixture – Chocolate cake, Soil, Air Pure substance – Water, Copper, Hydrogen Types of Mixtures There are two categories of mixtures: Homogeneous Mixtures and Heterogeneous Mixtures Homogenous Mixtures When we add sugar, water and lemon juice together they all uniformly ...
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Class 5th science written work Ch 1 Growth and development in Plants

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Date 24 April,2021 Day: Saturday Ch 1 Growth and development in Plants Give short answer to the following  Q1. What is germination? Ans: the process of converting a seed into seedling. Q2.  what are the necessary conditions for seed to germinate? Ans:   Temperature , moisture,  air , and  light  conditions must be correct for seeds to germinate. Q3. what is the role of cotyledons in the growth of a seedling Ans:  Cotyledons function  to provide the initial  growth  for the plant and as an energy source. Q4. what is vegetative reproduction? Ans: V egetative reproduction  is a method wherein new plants are produced by vegatative parts of a plant called propagules. The  vegetative  parts mean the leaf, stem and root.  Q5. How does soil affect the growth of the plant? Ans: Plants growth is greatly affected by the type of soil. different types of soil suitable for different kinds of plants. for example black soil...
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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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