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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 5th Science Chapter 2 Animal world written work

  Give short answer to the following questions 1. What is the natural place of living of an animal is called? Ans: Habitat 2. What are the breathing organs of fish or prawn? Ans: Gills 3. How does frog breathe when it is in water? Ans: Frogs use their thin skin to absorb oxygen in water. 4. How do the teeth of herbivores help them in eating? Ans: Teeth of herbivores help them in cutting and grinding the vegetation. 5. What are the functions of feathers? Ans: feathers help the birds to fly and protect them from cold.   Answer the following questions 1. How is a frog adapted to live both in water and on land? Ans: On land, frogs have gills which helped them breathing and in water they breathe through their thin skin which is present the under their mouth. 2. What features of a bird’s body help it to fly? Ans: birds have wings which help them to fly. Their bones are also light and hollow so they can fly easily. 3. How is a fish adapted to live in...
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