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CBSE CLASS 9 SCIENCE-NCERT Solutions

Unit-I: Matter - Its Nature & Behaviour

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Chapter - 1 Matter in Our Surroundings

Definition of matter; solid, liquid and gas; characteristics - shape, volume, density; change of state-melting (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation.

Chapter - 2 Is Matter around Us Pure

Elements, compounds and mixtures. Heterogenous and homogenous mixtures, colloids and suspensions.

Chapter - 3 Atoms and Molecules

Atoms and molecules, Law of constant proportions, Atomic and molecular masses. Mole concept : Relationship of mole to mass of the particles and numbers.

Chapter - 4 Structure of the atom

Electrons, protons and neutrons, valency, chemical formula of common compounds. Isotopes and Isobars.

Unit-II: Organisation in the Living World

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Chapter - 5 The Fundamental Unit of Life

Cell as a basic unit of life; prokaryotic and eukaryotic cells, multicellular organisms; cell membrane and cell wall, cell organelles; chloroplast, mitochondria, vacuoles, endoplasmic reticulum, Golgi apparatus; nucleus, chromosomes - basic structure, number.

Chapter - 6 Tissues, Organs, Organ System, Organism

Structure and functions of animal and plant tissues (four types in animals; meristematic and permanent tissues in plants).

Chapter - 7 Biological Diversity

Diversity of plants and animals - basic issues in scientific naming, basis of classification. Hierarchy of categories / groups, Major groups of plants (salient features) (Bacteria, Thalophyta, Bryo phyta, Pteridophyta, gymnosperms and Angiosperms). Major groups of animals (salient features) (Non-chordates upto phyla and chordates upto classes).

Chapter - 8 Health and Diseases

Health and its failure. Infectious and Non-infectious diseases, their causes and manifestation. Diseases caused by microbes (Virus, Bacteria and protozoans) and their prevention, Principles of treatment and prevention. Pulse Polio programmes.

Unit-III: Motion, Force and Work

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Chapter - 9 Motion

Distance and displacement, velocity; uniform and non-uniform motion along a straight line; acceleration, distance-time and velocity-time graphs for uniform motion and uniformly accelerated motion, equations of motion by graphical method; elementary idea of uniform circular motion.

Chapter - 10 Force and Newton's laws

Force and Motion, Newton's Laws of Motion, Action and reaction forces, Inertia of a body, Inertia and mass, Momentum, Force and Acceleration. Elementary idea of conservation of Momentum.

Chapter - 11 Gravitation

Gravitation; universal law of gravitation, force of gravitation of the earth (gravity), acceleration due to gravity; mass and weight; free fall.

Chapter - 12 Floatation

Thrust and pressure. Archimedes' principle, buoyancy, elementary idea of relative density.

Chapter - 13 Work, energy and power

Work done by a force, energy, power; kinetic and potential energy; law of conservation of energy.

Chapter - 14 Sound

Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo and SONAR. Structure of the human ear (auditory aspect only).

Unit-IV: Our Environment

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Chapter - 15 Physical resources

Air, Water, Soil. Air for respiration, for combustion, for moderating temperatures; movements of air and its role in bringing rains across India.

Air, water and soil pollution (brief introduction). Holes in ozone layer and the probable damages.

Chapter - 16 Bio-geo chemical cycles in nature

Water, oxygen, carbon and nitrogen.

Unit-V: Food; Food Production

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Chapter - 17

Plant and animal breeding and selection for quality improvement and management; use of fertilizers, manures; protection from pests and diseases; organic farming.

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  • 2 Comments
  • ncert-solutions
  • Mumtaz Saifi · 3 months ago
    Can i get a pdf file for all these?
    Reply
    • agam11 · 3 months ago
      gudddd.............
    • jks · 3 months ago
      great and helpfull......
  • Agam · 3 months ago
    Answer to question 9) CuSO4 + H2SO4 --->CuSO4 + H2 it should be like this Cu + H2SO4 --->CuSO4 + H2
    Reply