NCERT Solutions for Class 9 Science| Based on Updated Syllabus of CBSE

We have prepared the NCERT Solutions for Class 9 Science Textbook according to the latest syllabus of CBSE for Board Exams of 2020. In the Class 9, Science subject is compulsory for all. NCERT Solutions for Class 9 Science will help you a lot in this regard as it cover most of the important concepts and theory of the textbook that could come in the examination. Firstly, you must well aware of the solutions of NCERT Textbook of Class 9th Science, then after you can read reference books if you want. Here, we have provided chapterwise NCERT Solutions of Science Class 9th which are accurate and detailed. The answers are prepared by our StudyRankers experts who have taken care of each level and difficulty while answering the questions. You can view these solutions by clicking on the links of chapters provided here.

List of all Chapters of NCERT Solutions for Class 9 Science

  • NCERT Solutions of Chapter 1 Matter in Our Surrounding
  • NCERT Solutions of Chapter 2 Is Matter around us Pure?
  • NCERT Solutions of Chapter 3 Atoms and Molecules
  • NCERT Solutions of Chapter 4 Structure of the Atom
  • NCERT Solutions of Chapter 5 The Fundamental Unit of Life
  • NCERT Solutions of Chapter 6 Tissues
  • NCERT Solutions of Chapter 7 Diversity in Living Organisms
  • NCERT Solutions of Chapter 8 Motion
  • NCERT Solutions of Chapter 9 Force and Laws of Motion
  • NCERT Solutions of Chapter 10 Gravitation
  • NCERT Solutions of Chapter 11 Work and Energy
  • NCERT Solutions of Chapter 12 Sound
  • NCERT Solutions of Chapter 13 Why Do We Fall Ill?
  • NCERT Solutions of Chapter 14 Natural Resources
  • NCERT Solutions of Chapter 15 Improvement in Food Resources

NCERT Solutions of Ch 1 Matter in Our Surrounding

In first chapter of Class 9 Science NCERT Textbook, we will study about Matter. Everything in this universe is made up of material which scientists have named “matter”. The air we breathe, the food we eat, stones, clouds, stars, plants and animals, even a small drop of water or a particle of sand everything is matter.  Early Indian philosophers classified matter in the form of five basic elements – the “Panch Tatva”– air, earth, fire, sky and water.

NCERT Solutions of Ch 2 Is Matter Around us Pure?

So, is there any way to find out whether substances of daily use, like ghee, milk, even water is pure or not? Such ways are discussed in this chapter. In fact, milk itself is not a pure substance. It is a mixture. Mixtures are constituted by more than one kind of pure form of matter. Pure substances can be elements or compounds.

NCERT Solutions of Ch 3 Atoms and Molecules

An Indian philosopher Maharishi Kannad, postulated that if we go on dividing matter (padarth), we shall get smaller and smaller particles. Ultimately, a stage will come when we shall come across the smallest particles beyond which further division will not be possible. He named these particles Parmanu. In same era, ancient Greek philosophers – Democritus and Leucippus suggested that if we go on dividing matter, a stage will come when particles obtained cannot be divided further. Democritus called these indivisible particles atoms which means indivisible. These were philosophies. They were not based on experiments.

NCERT Solutions of Ch 4 Structure of Atom

Atoms and molecules are the fundamental building blocks of matter. The existence of different kinds of matter is due to different atoms constituting them. In the chapter we are going to discuss the constituents of atoms and how this constitutes are arranged in the atom. Defining atom was the major challenge before the scientists. It was known by 1900 that the atom was indivisible particle but contained at least one sub-atomic particle – the electron identified by J.J. Thomson. Credit for the discovery of electron and proton goes to J.J. Thomson and E.Goldstein, respectively.

NCERT Solutions of Ch 5 The Fundamental Unit of Life

This was in the year 1665 when Robert Hooke made an important observation through a self-designed microscope. He saw that the cork resembled the structure of a honeycomb consisting of many little compartments. Cork is a substance which comes from the bark of a tree. Cell is a Latin word for ‘a little room’. This was an important incident took place history of science. This was the very first time that someone had observed that living things appear to consist of separate units. Cell is the basic building block of all living beings. The shape and size of cells are related to the specific function they perform. Some cells like Amoeba have changing shapes. Each living cell has the capacity to perform certain basic functions that are characteristic of all living forms. These are activities like digestion of food, respiration, transportation etc.

NCERT Solutions of Ch 6 Tissues

In unicellular organisms, a single cell performs all basic functions. For example, in Amoeba, a single cell carries out movement, intake of food and gaseous exchange and excretion. But in multi- cellular organisms there are millions of cells. Most of these cells are specialised to carry out specific functions. Each specialised function is taken up by a different group of cells. We can say that, multi-cellular organisms show division of labour. Cells specialised in one function are often grouped together in the body.

NCERT Solutions of Ch 7 Diversity in Living Organisms

Each organism is different from the other to a lesser or greater extent. We all can consider people around us. They all are having different types nose, different colours of eyes. These differences are among human beings. These differences become more if we move from human beings to monkeys, and increases more if we mover from human beings to fish. The living world is diverse in many ways.

NCERT Solutions of Ch 8 Motion

Motion is defined for movement. If any object is continuously changing its position with time, it is said to be in motion. Examples are, a moving car, a boy running. If any object is not changing its position with time it is said to be in rest. A body may be in rest for one object and in motion for another. Two people sitting in train are in rest with respect to each other. But, they are in motion with some person the train. So, rest or motion is defined for some particular reference point. Here, we are basically concerned about straight line motion.

NCERT Solutions of Ch 9 Force and Law of Motion

Motion was discussed in previous chapter. What causes motion? A ball on the ground, when given a small hit, does not move forever. Such observations suggest that rest is the “natural state” of an object. This remained the belief until Galileo Galilee and Isaac Newton developed an entirely different approach to understand motion. In force, both magnitude and direction is considered. Concept of balanced and unbalanced force is discussed. In balanced force, net force is zero, as equal magnitude of force is applied from opposite sides.

NCERT Solutions of Ch 10 Gravitation

In previous chapter it is discussed force is required for motion. We have learnt that a force is needed to change the speed or the direction of motion of an object. We always observe that an object dropped from a height falls towards the earth. We know that all the planets go around the Sun. The moon goes around the earth. In all these cases, there must be some force acting on the objects, the planets and on the moon.  Sir Isaac Newton figured out that force responsible for all these things is Gravitational force.  The gravitational force is force acting between two bodies due to their masses.

NCERT Solutions of Ch 11 Work and Energy

In previous chapter, we have discussed about force, motion and gravitation. Another concept that helps us understand and interpret many natural phenomena is ‘work. We need energy for other activities like playing, singing, reading, writing, thinking, jumping, cycling and running. Activities that are strenuous require more energy. Work and energy are related. Both are explained one by one.

NCERT Solutions of Ch 12 Sound

Sound is a form of energy which produces a sensation of hearing in our ears. Different types of sound we hear in our day to day to life. These are the sounds of bird, horn of cars, children crying around and many more. There are also other forms of energy like mechanical energy, light energy etc. We know that energy is conserved and can change its form. When we clap, the mechanical energy is converted into sound energy.

NCERT Solution of Ch 13 Why do we fall Ill?

Health and disease in human communities are very complex issues. In our organs or tissues, there are various specialised activities going on – the heart is beating, the lungs are breathing, the kidney is filtering urine, the brain is thinking. All these activities are interconnected. For healthy well-being, it is very important every organ of human beings should work properly. In this chapter the term health is defined and explained.

NCERT Solutions of Ch 14 Natural Resources

The resources available on the Earth and the energy from the Sun are necessary to meet the basic requirements of all life-forms on the Earth. These are the land, the water and the air. All these resources are discussed one by one.
Air is a mixture of many gases like nitrogen, oxygen, carbon dioxide and water vapour. Role of atmosphere as climate controller is discussed. After that, wind formation is discussed. Movement of air form land to sea and sea to land is discussed.

NCERT Solutions of Ch 15 Improvement in Food Resources

All living organisms need food. Food supplies proteins, carbohydrates, fats, vitamins and minerals, all of which we require for body development, growth and health. Both plants and animals are major sources of food for us. We obtain most of this food from agriculture and animal husbandry. The improvement in food resources includes both enhancing the quantity and quality of food resources.