Download Class 9 Science NCERT Solutions Chapter Wise

Overview Of the Class 9 Science NCERT Solutions Chapter-Wise

Matter in Our Surroundings

This chapter explains that everything around us is made of matter, which exists in three physical states: solid, liquid, and gas. It discusses how matter changes its state due to temperature and pressure, and introduces concepts like evaporation, condensation, and latent heat. The chapter helps students understand the physical nature of matter and how energy affects it.

Is Matter Around Us Pure?

This chapter focuses on the difference between pure substances and mixtures. It explains types of mixtures (homogeneous and heterogeneous), methods of separation like filtration, evaporation, distillation, and chromatography. It also discusses elements, compounds, and their symbols. The aim is to help students understand the composition and purity of substances we use daily.

Atoms and Molecules

The chapter introduces the laws of chemical combination (Law of Conservation of Mass and Law of Constant Proportions). It explains how elements combine to form compounds using atoms and molecules, and how chemical formulas are written. Concepts like atomic mass, molecular mass, and mole are also covered, helping students understand the building blocks of matter.

Structure of the Atom

This chapter explains how scientists like J.J. Thomson, Rutherford, and Niels Bohr developed models to describe the structure of an atom. It introduces protons, neutrons, and electrons, their arrangement in shells, and atomic numbers and mass numbers. Students learn how atoms form ions and isotopes, and how nuclear structure explains chemical behaviour.

The Fundamental Unit of Life

This chapter introduces the cell as the basic structural and functional unit of life. It covers cell structure (cell membrane, nucleus, cytoplasm) and the functions of organelles like mitochondria, endoplasmic reticulum, Golgi apparatus, etc. It also explains the differences between plant and animal cells and introduces the concept of cell theory.

Tissues

The chapter explains how similar cells form tissues that perform specific functions. It covers plant tissues (meristematic and permanent) and animal tissues (epithelial, connective, muscular, and nervous). The topic helps students understand how multicellular organisms are organised and how different tissues work together for survival.

Motion

This chapter introduces the concept of motion, describing how objects move using terms like distance, displacement, speed, velocity, and acceleration. It explains motion graphs and the equations of uniformly accelerated motion. The chapter builds the foundation for understanding mechanics in physics.

Force and Laws of Motion

Here, students learn about Newton’s three laws of motion and how they explain the relationship between force and motion. It also introduces inertia, momentum, and the concept of balanced and unbalanced forces. The chapter shows how everyday motion, from walking to driving, follows these physical laws.

Gravitation

This chapter deals with Newton’s law of gravitation, explaining how every object in the universe attracts every other object. It also discusses free fall, acceleration due to gravity, mass and weight, and buoyancy. Students learn how gravity affects everything from falling objects to planetary motion.

Work and Energy

The chapter defines work, energy, and power, explaining when work is said to be done. It discusses different forms of energy (kinetic and potential), the work-energy theorem, and the law of conservation of energy. Real-life examples are used to show how energy transforms from one form to another.

Sound

This chapter explains how sound is produced, travels, and is heard. It introduces the concepts of frequency, amplitude, wavelength, and speed of sound in different media. It also covers sound reflection, echo, and applications such as SONAR. Students understand that sound is a form of energy that travels as waves.

Improvement in Food Resources

The final chapter focuses on improving the quality and quantity of food. It discusses crop production, animal husbandry, fisheries, and poultry farming. It explains sustainable practices like irrigation, fertilizers, and pest control. The aim is to make students aware of modern agricultural methods and food security.

CBSE NCERT Solutions for Class 9 Science: Study Materials

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