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NCERT Solutions for Class 9 Science have been provided in the article. NCERT Solutions Class 9 Science covers important topics like Matter, Atoms & Molecules, Fundamental Unit of Life, Tissues, Motion, Force, Laws of Motion, Gravitation, Sound, Natural Resources.
NCERT Solutions for Class 9 Science: Chapter-Wise Solutions
NCERT Solutions for Class 9 Science are provided as below:
NCERT Solutions for Class 9 Science: Chapter-Wise Details
NCERT Solutions for Class 9 Science will assist students to clear and solve their doubts about the NCERT Textbook questions that are important from an exam point of view. The links for chapter-wise important topics have been provided below for the easy reference of the students.
Chapter 1 Matter in Our Surroundings
Matter in Our Surroundings is the first chapter of CBSE Class 9 Science. The chapter deals with concepts of Matter, which is defined as anything that occupies space and has mass. Matter around us exists in three different states, solids, liquids and gasses. The three states of matter can be changed by changing the temperature or pressure.
Important Topics:
- Cooling Due to Evaporation
- Effect of Change of Temperature on the State of Matter
- Effect of Change of Pressure on the State of Matter
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Chapter 2 Is Matter Around Us Pure
The second chapter deals with mixtures, separation of mixtures, solutions, properties of solutions, physical and chemical changes, etc. A mixture contains more than one substance mixed in any proportion. A substance can be an element or a compound.
Important Topics:
- Elements
- Compounds
- Heterogeneous and Homogenous Mixtures
- Physical and Chemical Changes
- What is a Colloidal Solution?
- Difference between Mixtures and Compounds
- Dispersed phase
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Chapter 3 Atoms and Molecules
Atoms are the fundamental unit of matter, making up literally everything around us. An atom is extremely small, measuring less than 0.1 to 0.5 nanometers. A molecule is the smallest unit of a compound that contains the chemical properties of the specific compound.
Important Topics:
- Law of Conservation of Mass
- Molecular Mass
- Law of Definite Proportions
- Molar mass
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Chapter 4 Structure of The Atom
The structure of an atom comprises three subatomic particles, protons, neutrons and electrons. These components offer the mass and charge of the atoms. The electrons orbit around the nucleus, which comprises protons and neutrons.
Important Topics:
- Electrons, Protons and Neutrons
- Thomson’s Model of an Atom
- Rutherford Model of an Atom
- Atomic Number
- Valency
- Chemical Formulas
- Isotopes
- Isobars
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Chapter 5 The Fundamental Unit of Life
Cells are the functional unit of life. A group of cells acts together to form tissues, eventually developing organs and organ systems. The chapter deals with cells and their structure and covers topics such as plasma membrane, cell wall, nucleus, cytoplasm, and structure of a plant cell and animal cell.
Important Topics:
- Cell Wall
- What are Living Organisms Made Up of?
- Nucleus of a Cell
- Difference between Prokaryotic and Eukaryotic Cells
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Chapter 6 Tissues
Tissues are a group of cells that combine together to perform a particular function. A group of tissues is responsible for developing an entire organ system. The chapter deals with tissues, including plant and animal tissues with a diagrammatic presentation.
Important Topics:
- Permanent Tissues
- Complex Permanent Tissues
- Xylem and Phloem
- Epithelial Tissues
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Chapter 7 Diversity in Living Organism
Diversity in Living Organisms refers to the presence of different organisms in the same ecosystem leading to equilibrium. This chapter deals with the classification of plants and animals. All living organisms present on Earth are divided into five kingdoms, Monera, Protista, Fungi, Plantae and Animalia.
Important Topics:
- Nomenclature
- Pisces
- Amphibia
- Reptilia
- Mammalia
- Biodiversity in Plants and Animals
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Chapter 8 Motion
Motion is defined as the movement of an object from one position to another with respect to the observer. The chapter also deals with the three equations of motion and numerical problems. The chapter is a mix of theoretical as well as numerical concepts.
Important Topics:
- Distance and Displacement
- Velocity
- Uniform Motion and Non-uniform Motion
- Acceleration
- Distance-Time Graphs
- Velocity-Time Graphs
- Uniform Circular Motion
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Chapter 9 Force and Law of Motion
There are three laws of motion that have been explained with the help of diagrams and examples in this chapter.
- The first law of motion states that an object continues to be in a state of rest unless acted upon by an unbalanced force.
- The second law of motion states that the rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the force.
- The third law of motion defines that every action has an equal and opposite reaction.
Important Topics:
- Force and Motion
- Newton’s Laws of Motion
- Action and Reaction
- Inertia and Mass
- Momentum
- Force and Acceleration
- Conservation of Momentum
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Chapter 10 Gravitation
Universal law of gravitation states that every object in the universe attracts every other object by a force directly proportional to the product of their masses and is inversely proportional to the square of the distance between them. The chapter involves the law and its importance along with numerical problems.
Important Topics:
- Force of Gravitation of the Earth
- Acceleration Due to Gravity
- Mass and Weight
- Free Fall
- Pressure in Fluids
- Thrust and Pressure
- Archimedes’ Principle
- Relative Density
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Chapter 11 Work and Energy
The chapter deals with the concept of Work in Physics. In Physics, work done is defined as the product of the magnitude of the force acting on the body and the displacement in the direction of the force. Energy is defined as the ability to do work and its unit is the same as work. The chapter involves both theoretical and numerical questions.
Important Topics:
- Work Done by a Force
- Work and Energy
- Power
- Kinetic Energy
- Potential Energy
- Law of Conservation of Energy
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Chapter 12 Sound
Class 9 Science Chapter 12 deals with the concept of Sound. Sound is defined as the sensation perceived by the sense of hearing. The chapter deals with concepts of production and propagation of sound, the reflection of sound, range of hearing, ultrasound and its applications, the structure of the human ear, and more.
Important Topics:
- Echo
- Reverberation
- Range of Hearing
- Applications of Ultrasound
- Sonar
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Chapter 13 Why Do We Fall Ill
The chapters involve the concept of health and various types of diseases. Health is a state of physical, mental and social well-being in its complete form. The chapter comprises topics like health, disease and its cause, infectious diseases, etc.
Important Topics:
- Immune System
- Human Diseases
- Symptoms and Signs of Diseases
- Causes of Diseases
- Infectious Diseases
- Pathogens
- Immunization
- Vaccination
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Chapter 14 Natural Resources
Natural Resources are essential to meet the basic requirements of all forms of life on Earth. Land, water and air are the resources of the earth along with fossil fuels, sunlight, wind, minerals, etc. The living things are referred to as biotic factors and the non-living things are the abiotic components of the biosphere.
Important Topics:
- Air, Water, Soil
- Air Pollution
- Water Pollution
- Soil Pollution
- Ozone Layer
- Bio-Geo Chemical Cycles in Nature
- Water Cycle
- Oxygen Cycle
- Nitrogen Cycle
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Chapter 15 Improvement in Food Resources
The last chapter of Class 9 Science deals with the concepts such as improvement in crop yields, manure and fertilizer, storage of grains, animal husbandry. The chapter offers detailed knowledge regarding agriculture, farming and dairy.
Important Topics:
- Agriculture
- Crop Variety Improvement
- Hybridisation
- Crop Production Improvement
- Animal Husbandry
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