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CHAPTER 5  THE FUNDAMENTAL UNIT OF LIFE ANIMAL CELL PLANT CELL This article brings you the CBSE Class 9 Science notes on chapter 5 'FUNDAMENTAL UNIT OF LIFE'. These chapter notes are prepared by the subject expert and cover every important topic from the chapter. In between these notes, exercise questions are provided. Students must solve these questions to test their understanding about the learned topics. These questions will help you to track your preparation level and get a hold on the subject.  In this chapter 5 'FUNDAMENTAL UNIT OF LIFE we cover following topics - Discovery of cell, Cell, Classification of organisms on the basis of Cell, Shape and size of the Cell, Diffusion, Osmosis, Types of Osmosis , Types of Osmotic Solutions, Plasma membrane or Cell membrane, Cell Wall, Function of Cell wall, Nucleus, Types of plastids, Cytoplasm, Cell Organelles, Functions of Vacuoles and Plastids,  Types of Endoplasmic Reticulum. Important Notes Of CHAPTER 5 'FUNDAMENTAL UN

 CHAPTER 15  SOME NATURAL PHENOMENA Here is the answer of chapter 15 SOME NATURAL PHENOMENA of NCERT science of class 8.The complete solution of CHAPTER 15 SOME NATURAL PHENOMENA is given here which is prepared subject expert. Some important extra questions and important points about Chapter 15 are also given. Select the correct option in Questions 1 and 2. 1.Which of the following cannot be charged easily by Friction? a) A plastic scale. b) A copper rod. c)An inflated balloon. d) A woollen cloth. Ans. b) A copper rod Ques 2. When a glass rod is rubbed with a piece of silk cloth the rod a) and the cloth both acquire positive charge. b) becomes positively charged while the cloth has a negative charge. c) and the cloth both acquire negative charge. d) becomes negatively charged while the cloth has a  positive charge. Ans. b) becomes positively charged while the cloth has a negative charge. Ques 3. Write  T against True and F against False in the following statements. a) Like charges attr

 CHAPTER 1  MATTER IN OUR SURROUNDINGS Chapter 1 MATTER IN OUR SURROUNDINGS of SCIENCE NCERT of CLASS 9 complete solution and some important points are given. This will help student to better understand the topic and can easily solve the problems related to CHAPTER 1 MATTER IN  OUR SURROUNDINGS Class 9. SOME IMPORTANT POINTS OF CHAPTER 1  MATTER IN OUR SURROUNDINGS I) Melting point :- The temperature at which solid melts to became a liquid at the atmospheric pressure is called its melting point. II) Fusion :- The process of melting that is change of solid state into liquid states is also known as fusion. III) Latent Heat Of vapourisation:- The amount of heat energy that is required to change 1kg of liquid into gas(vapour) at its boiling point is known as latent heat of vapourisation. IV) Latent heat of Fusion :- The amount of heat energy that is required to change 1kg of solid into liquid at atmospheric pressure as its melting point is known as latent heat of Fusion. V) Boiling Poi

CHAPTER 13  SOUND Here is the answer of chapter 13 SOUND of NCERT science of class 8.The complete solution of CHAPTER 13  SOUND is given here which is prepared subject expert. Some important extra questions and important points about Chapter 13 are also given. Textbook questions:- Ques1.  Choose the correct answer.  (1)  Sound can travel through a)Gases only b)Solids only c)Liquids only d)Solids, liquids and gases  Ans 1. Solids, liquids and gases.  Ques 2) Voice of when of the following is likely           to have minimum frequency?  a)Baby girl  b)Baby boy  c)A man  d)A woman  Ans.2 Baby girl Ques 3.   In the following statements, tick 'T' against those which are true and 'F' against those which are false. a)Sound cannot travel in vaccum. (T/F) b)The number of oscillations per second of a vibrating object is called its time period. (T/F) c)If the amplitude of vibration is large, sound is feeble. (T/F) d)For Human ears, the audible range is 20Hz to 20,000Hz.(T/F) e)The

Chapter 12 Friction Here is the answer of chapter 12 FRICTION  of NCERT science of class 8.The complete solution of CHAPTER 12 FRICTION is given here which is prepared subject expert. Some important extra questions are also given with their answers. Textbook Questions Ques1 Fill in the blanks.  (a)  Friction opposes the ________between the surfaces in contact with each other.   b)Friction depends on the ________of surfaces.  c)Friction produces __________. d) Sprinkling of powder on the carrom board ______ friction.  e) Sliding friction is ________than the static friction.  Answers. a)Motion b)nature c)heat d )Reduces e)  Less Ques2. Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order.Their arrangements are given below. Choose the correct arrangement . a)  Rolling, static, sliding (b) Rolling, sliding, static c) Static, sliding, rolling (d) Sliding, static, rolling Ans2.c)  static,sliding,rolling  Static friction is greater tha

 CHAPTER 11  FORCE AND PRESSURE Here is some important points and answer of chapter 11 FORCE AND PRESSURE NCERT science of class 8.These important points help the student to better understanding of the topic of CHAPTER 11 FORCE AND PRESSURE OF CLASS 8. The complete solution of CHAPTER 11 FORCE AND PRESSURE is given here  which is prepared subject expert. Important Points:- a) Force:- A push or pull of an object is called force. b) Nature of Force:- Force applied on an object in the same direction add to one another and if two forces acting on an object in opposite direction then the net force is the difference  of  between the two forces. c) Contact force:- When a force is applied physically through a direct contact between two object. Example:- Muscular force and Frictional Force. d) Non contact force:-  When a force is applied between bodies without being in contact with each other are known as non contact force. For example:- electrostatic force and gravitational force. e) Muscular

 CHAPTER 18  POLLUTION OF AIR AND WATER Here is some important points and answer  of chapter 18   POLLUTION OF AIR AND WATER  NCERT science of class 8 which helps students to better understand the  topics of chapter. Important Points:- i) Pollution:- The contamination of any natural resources by unwanted substance or impurities is called Pollution. ii) Global warming:- Increase in the average temperature of the earth due to green house effect and other reason is called Global Warming. iii) Green house effect:- The availity of the earth's atmosphere to trap and reflect radiation of the sun is called Green house effect. iv) Air Pollution:- When air got contaminated by impurities  is known as Air pollution. v) Chemical Contimination:- The chemical which are created disturbance in environment are known as Chemical Contimination. vi) Pollutants:- Particles or substance which creates disturbances in the environment  resources such as water, soil,etc are called pollutants. vii) Portable w