NCERT Solutions for Class 9 Science Science

Science NCERT Grade 9, Chapter 1, Matter in Our Surroundings deals with the basic concepts that a student would require to gain knowledge about the matter. Important physical properties of matter are discussed in the chapter. The chapter, Matter in Our Surroundings revolves around the particles which forms matter and the properties of such particles.
The physical nature of matter and the characteristics of the particles along with a detailed discussion on the three states of matter: solid, liquid and gaseous state is covered in this chapter. The concept of evaporation and the factors affecting evaporation are also included in the chapter. Each section is supplemented with numerous definitions, examples, activities, and images which makes it more engaging. The chapter, Matter in Our Surroundings ends with a summary along with a set of exercises mentioned at the end of the chapter so as to test the conceptual understanding.

Science NCERT Grade 9, Chapter 2, Is Matter Around Us Pure? deals with the basic concepts associated with matter. The details of mixture and solutions are provided in the chapter with the help of examples from everyday life. Definition of the terms mixture and solutions are also included. Various processes involved in separating the components of the mixture are explained in a comprehensive manner.
The concept of physical changes and chemical changes is also taken into consideration in the chapter, Is Matter Around Us Pure? Apart from this, the pure substances are explained with the help of examples. Each of the above topics is explained in detail with the help of suitable examples, diagrams and activities. Topic-wise assessment of the chapter, Is Matter Around Us Pure? is done through questions provided at the end of each topic. Summarization of all the important points of the chapter is done at the end. A set of exercises consisting of 11 different questions followed by a group activity checks the conceptual understanding of the chapter, Is Matter Around Us Pure?

Science NCERT Grade 9, Chapter 3, Atoms and Molecules gives an insight into the concepts associated with atoms and their molecules. This chapter throws light on the concepts of laws of chemical combination, Dalton’s atomic theory, symbols of atoms and atomic mass. Moreover, it covers discussion on the procedure to write chemical formulas using symbols and valency of elements. Emphasis is also laid upon the concept of molecular mass and mole concept. Each of the above topics is explained in detail with the help of suitable examples, diagrams and activities.
Topic-wise assessment of the chapter, Atoms and Molecules is done through questions provided at the end of each topic. Summarization of all the important points of the chapter is done at the end. A set of exercises consisting of 11 different questions followed by a group activity checks the conceptual understanding of the chapter, Atoms and Molecules.

Science NCERT Grade 9, Chapter 4, Structure of the Atom goes a little deeper into the concept of atom studied in the previous chapter, Atoms and Molecules. Emphasis is laid on the sub-atomic particles of atom- electrons, protons and neutrons. Three models of atoms are explained in detail along with their postulates, diagrammatic view and drawbacks:

• Thomson’s model of an atom
• Rutherford’s model of an atom
• Bohr’s model of an atom

The atomic structure and valency of the first eighteen elements are presented in the chapter. Understanding of each topic of the chapter, Structure of the Atom is made easier by adding examples, activities and diagrams. In addition to this, the topic-wise assessment of the understanding is done with the help of questions provided at the end of each topic. A recap of all the important points of the chapter, Structure of the Atom is provided at the end followed by a set of exercises which tests the overall understanding of concepts mentioned in the chapter. 

Science NCERT Grade 9, Chapter 5, The Fundamental Unit of Life deals with the basic concepts that a student would require to gain knowledge about cell- the fundamental unit of life. The chapter focuses on the characteristics of a cell, based on its features like shape, size and functions. Apart from this, the structural organization of the cell is also covered in detail. The important parts of the cell, like plasma membrane, nucleus, cell wall, cytoplasm etc. are discussed with the help of suitable diagrams along with cell organelles.

Each of the above topics is explained in detail with the help of suitable examples, diagrams and activities. Topic-wise assessment of the chapter, The Fundamental Unit of Life is done through questions provided at the end of each topic. Summarization of all the important points of the chapter, The Fundamental Unit of Life is done at the end. A set of exercises consisting of different questions followed by a group activity checks the conceptual understanding of the chapter.

Science NCERT Grade 9, Chapter 6, Tissues covers the fundamentals associated with body tissues in an extensive manner. The structure and function of important tissues are covered in the chapter. Important concepts related to plant tissues and animal tissues are dealt with separately in the chapter, Tissues. The plant tissues are discussed under two categories: meristematic tissues and permanent tissues.

Similarly, the animal tissues are divided into different types like (a) epithelial tissues (b) connective tissues (c) muscular tissues (d) nervous tissues. Understanding of each topic is made easier by adding examples, activities and diagrams. In addition to this, the topic-wise assessment of the understanding is done with the help of questions provided at the end of each topic.
A recap of all the important points of the chapter, Tissues are provided at the end followed by a set of exercises which tests the overall understanding of concepts mentioned in the chapter. 

Science NCERT Grade 9, Chapter 7, Diversity in Living Organisms familiarizes the students with a vast variety of living organisms present on this planet. Hierarchical classification of organisms into different kingdoms are comprehensively discussed in the chapter. Focus is given on the 5 kingdom classification of Whittaker which includes: Monera, Protozoa, Fungi, Plantae, Animalia. The sub-classification of plants and animal kingdoms are covered in detail along with suitable examples. The concept of nomenclature of organisms is also explained in the chapter, Diversity in Living Organisms.
Each of the above topics is explained in detail with the help of suitable examples, diagrams and activities. Topic-wise assessment of the chapter is done through questions provided at the end of each topic. Summarization of all the important points of the chapter, Diversity in Living Organisms is done at the end. A set of exercises consisting of different questions followed by a group activity checks the conceptual understanding of the chapter.

Science NCERT Grade 9, Chapter 8, Motion deals with all the basic concepts associated with the motion of an object. Emphasis is laid upon the concepts like distance and displacement, uniform and non-uniform motion, speed and velocity and acceleration. Apart from this, the graphical representation of motion and equations of motion are also taken into consideration in the chapter, Motion. Understanding of each topic of the chapter, Motion is made easier by adding examples, activities and diagrams.
In addition to this, the topic-wise assessment of the understanding is done with the help of questions provided at the end of each topic. A recap of all the important points of the chapter, Motion is provided at the end followed by a set of exercises which tests the overall understanding of concepts mentioned in the chapter.

Science NCERT Grade 9, Chapter 9, Force and Laws of Motion deals with the basic concepts that a student would require to gain knowledge about the force and the laws governing different aspects of the object under the influence of force. The chapter lays emphasis on the concepts like balanced and unbalanced forces, the first law of motion or the law of inertia, the second law of motion and the third law of motion. All the three laws are explained with the help of examples along with their applications in day to day life. It also covers the concept of conservation of momentum.
The above topics are explained in detail with the help of suitable examples, diagrams and activities. Topic-wise assessment of the chapter, Force and Laws of Motion is done with the help of questions provided at the end of each topic. Summarization of all the important points of the chapter is done at the end. A set of exercises consisting of 11 different questions followed by a group activity checks the conceptual understanding of the chapter, Force and Laws of Motion.

Science NCERT Grade 9, Chapter 10, Gravitation deals with the basic fundamentals associated with the force of gravitation. Various aspects related to gravitation are explained in detail in this chapter. The concepts such as universal law of gravitation, centripetal force, Newton's inverse square law are explained in detail. Apart from this, the chapter, Gravitation consists of concepts like free fall, acceleration due to gravity, mass and inertia.
The chapter, Gravitation also discusses the Archimedes principle and the concept of buoyancy and relative density. Understanding of each topic of the chapter, Gravitation is made easier by adding examples, activities and diagrams. In addition to this, the topic-wise assessment of the understanding is done with the help of questions provided at the end of each topic. A recap of all the important points of the chapter, Gravitation is provided at the end followed by a set of exercises which tests the overall understanding of concepts mentioned in the chapter. 

Science NCERT Grade 9, Chapter 11, Work and Energy includes a sectional explanation of the concepts related to work and energy. The chapter focuses on concepts like work, scientific conception of work and work done by a constant force. Apart from this, the emphasis is laid on the concepts of energy such as the forms of energy, kinetic energy, potential energy and the potential energy of an object at a height. The law of conservation of energy is also stated in the chapter. Understanding of each topic of the chapter, Work and Energy is made easier by adding examples, activities and diagrams.
In addition to this, the topic-wise assessment of the understanding is done with the help of questions provided at the end of each topic. A summary of all the important points of the chapter, Work and Energy is provided at the end followed by a set of exercises which tests the overall understanding of concepts mentioned in the chapter.

Science NCERT Grade 9, Chapter 12, Sound deals with the fundamentals of sound and its related aspects. The chapter consists of various important concepts like production of sound, propagation of sound longitudinal waves of sound and speed of sound in different media. In addition to this, the chapter explains the concepts of reflection of sound and characteristics of the sound wave. The terms like echo, reverberation, ultrasound and sonar are explained in the chapter, Sound. A detailed understanding of the mechanism of hearing along with a structure of the human ear is provided.

The chapter, Sound is summarized at the end and the assessment of understanding of the concepts is done by providing a set of exercises consisting of different questions.

Science NCERT Grade 9, Chapter 13, Why do We Fall Ill? Familiarizes the students with the importance of good health. The topics associated with health are covered in detail. The concepts like - the significance of health, the difference between healthy and disease-free body is well explained in the chapter.

Additionally, the chapter, Why do We Fall Ill? covers a discussion on acute and chronic diseases, infectious and non-infectious diseases. Methods of transmission of diseases and principle of treatment as well as prevention of disease are explained in detail. Each of the above topics is explained in detail with the help of suitable examples, diagrams and activities. Topic-wise assessment of the chapter, Why do We Fall Ill? is done through questions provided at the end of each topic. Summarization of all the important points of the chapter is done at the end. A set of exercises consisting of 11 different questions followed by a group activity checks the conceptual understanding of the chapter, Why do We Fall Ill? 

Science NCERT Grade 9, Chapter 14, Natural Resources gives an insight into the details of abiotic resources found on earth. The three main natural resources discussed in the chapter are land, water and air. The characteristics of each resource are explained in an extensive manner. Information on concepts like wind, air currents, rain etc are discussed comprehensively. Apart from this, the types of pollution like air pollution and water pollution are covered in the chapter. The formation of soil and the factors on which the formation of soil depends are also mentioned. The chapter, Natural Resources lays emphasis on different biogeochemical cycles along with their schematic view.
Understanding of each topic of the chapter, Natural Resources is made easier by adding examples, activities and diagrams. In addition to this, the topic-wise assessment of the understanding is done with the help of questions provided at the end of each topic. A short recap of all the important points of the chapter, Natural Resources is provided at the end followed by a set of exercises which tests the overall understanding of concepts mentioned in the chapter.

Science NCERT Grade 9, Chapter 15, Improvement in Food Resources throws light on the concepts of different improvement techniques undertaken in various dimensions of food resources. The chapter, Improvement in Food Resources covers the important topics such as improvement in crop yields, crop variety improvement and crop production management. Here, the chapter focuses on nutrient management, irrigation and cropping patterns. Apart from this, the chapter covers an explanation of crop protection management and animal husbandry wherein, cattle farming, poultry farming, egg and broiler production, fish production and beekeeping is taken into consideration.

Summarisation of all the important points of the chapter is done at the end. A set of exercises consisting of 11 different questions followed by a group activity checks the conceptual understanding of the chapter, Improvement in Food Resources.