Class 9 notes for science


Our class 9 notes for science are mostly in line with the NCERT syllabus and CBSE guidelines. These NCERT notes can be consulted by students to gain a better understanding of the key questions and the overview of the chapters. Students can retain key terms better and be prepared for any type of exam questions.

Check the links given below for more information about Class 9 Science notes.


Chapter 1: Matter In our surroundings class 9 notes for science

  • Everything in this universe is made of materials which scientist has names ‘matter’.The matteris made up of very small tiny particles. It is not continuous but is particulate.
  • The matteris anything that occupies space and has mass.
  • Particles of matter have space between them and are continuously moving.
  • Particles of matter attract each other.

Chapter 2: Is Matter Around us pure class 9 notes for science

All objective phenomena are based on matter and energy. Also, matter can be defined as anything that occupies space and has masses, according to science chapter 9 notes. Matter is composed of two elementary particles, which are quarks and leptons. There are two types of mater: pure substance and mixed substances. Pure substance is composed of one type of particle, which means it is uniform in composition. However, mixtures can contain more than one type.


Chapter 3: Atoms and Molecules Class 9 Notes for Science

A significant part of any chemical reaction is the interaction between molecules and atoms. A atom is a small part of matter that exhibits the same properties as the element. Some atoms can be formed by ions or molecules, but others are non-independent. Molecules can be formed by the combination of multiple atoms using chemical bonds. It is the smallest element of an element that has its properties. Two or more atoms can form a molecular structure through chemical bonding. This section provides detailed information on atoms 9 notes for science.


Chapter 4: Structure of Atom Class 9 Notes for Science

An atom is the smallest unit of matter that retains all of the chemical properties of an element. Molecules can be formed by the combination of atoms. These atoms then interconnect to form solids, liquids, or gases. The structure of an Atom Class 9 Notes will show that an Atom has two regions. One is the nucleus, which forms the center of the atom, and contains neutrons, protons, and the other is the outer region, which holds the electron in its orbit around it. The negative charge of a neutron is equal to that of a proton.


Chapter 5: The Fundamental Unit of live Class 9 Notes for Science


Chapter 6: Tissues Class 9 notes for science

Tissue refers to a group of cells with similar origin, structure and function. Histology is the study of tissues.

Amoeba, a unicellular organism, performs all the basic functions. Multi-cellular organisms (Plants & Animals) show division of labor in plant tissues and animal tissue.


Chapter 7: Diversity in living organism Class 9 notes for sicence

Biodiversity is the diversity of life. Different organisms require classification. The phylogenetic classification is determined by the evolutionary history. H. Whittaker suggested the five-kingdom system for classification. Identification is only possible with a distinct name. Common names are not scientific. Binomial nomenclature refers to scientific naming of organisms. Taxonomic hierarchy refers to the framework of classification that aids in placing organisms correctly.


Chapter 8 : Motion Class 9 notes for sicence

When an object’s position changes with the passage of time, it is considered to be in motion. A reference point is used to describe an object’s location. Motion is relative. A total distance covered by an object is the distance it has traveled. The displacement is the shortest distance/path measured between the initial and final positions of an object.


Chapter 9: Force and Law of Motion Class 9 notes for Science

Force It’s a force or pull on an object that causes acceleration in the body it acts on. S.I. Newton is the unit of force. A force can alter the speed of a human body in three ways. It can also change the direction of motion. It can also alter the body’s shape.


Chapter 10: Gravitation Class 9 notes for Science

Universal law of gravitation: All objects attract each other with a force proportional to their mass and ininverse proportional to their distance. The line connecting the centers of two objects is the force. The universal law of gravitation has successfully explained many phenomena, including: (i) The force that binds the earth to us. (iii) The motion of the moon around the earth. (iii). The motion of the planets around the sun. (iv) The tides caused by the sun and moon.


Chapter 11: Work, Power and Energy Class 9 notes for Science

 The magnitude of the applied force multiplied with the distance the object moves in the direction of the force is called work done on an object. Work done = forcexdistance = Fxs, 1 Joule =1 Newtonx1 metre. The unit of work in joules. Energy is the body’s ability to do work. Joule is the unit of energy in S.I. (1 KJ = 1000J). Form of energy: (P.E. & K.E. Kinetic energy refers to the energy that a moving body can obtain by virtue of its movement


Chapter 12:Sound Class 9 notes for Science

Sound is a form of mechanical energy that produces the sensation of hearing. Vibration of different objects creates sound. Compressions and rarefactions within the medium propagate sound waves. Longitudinal waves are sound waves. Variations in the pressure and density of the medium can produce sound waves. When a sound wave passes through a medium, compression is the temporary increase or decrease in volume and density.


Chapter 13: Why Do we Fall ill Class 9 notes for science

It is the ability of a body to function properly, mentally and socially. We call it a healthy body if it is in good mental and physical condition. A healthy body is not only a body that is free from illness or weakness, but also a state of complete physical, mental, and social well-being. A disease is a condition that causes an abnormal function or condition in a particular part of the body or entire organism. A diseased body is a body that has been infected by a disease


Chapter 14: Natural Resources Class9 Notes for Science


All life forms on Earth need to be able to rely on the resources and energy of the Sun for their basic needs. The lithosphere is the outer crust of the Earth. These are the hydrosphere. The atmosphere is the air that blankets the Earth. The atmosphere is where the lithosphere (hydrosphere) and atmosphere (atmosphere) are all found. The biosphere is the life-sustaining zone on the Earth, where the atmosphere and hydrosphere interact to make life possible


Chapter 15: Improvement In Food Resources Class 9 Notes for Science

Food provides nutrients, proteins, carbohydrate, fats, vitamins, and minerals that are essential for our bodies’ development, growth, and health. Different crops need different climatic conditions, temperatures and photoperiods to grow and complete their life cycles. The duration of sunlight is a key factor in determining photoperiods. The sun is essential for the growth of flowers and plants

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