# NCERT Solutions for Class 9 Science

NCERT Solutions for Class 9 Science: Interest in science in the early stage is a very important factor to decide career paths in your higher education especially if you are in class 9. In this article, you will find solutions of NCERT class 9 science explained through a logical approach making it easy for you to learn science. On the fundamental level science is very interesting but if you do not take an interest you will be stuck, and won't be able to understand the complicated concepts. To solve questions asked in your NCERT textbook, you can take the help of CBSE NCERT solutions for class 9 science. The NCERT science textbook of class 9 is crucial as it teaches the basic chapters to lay a strong foundation for the higher classes like 10th, 11th and 12th. If you are very curious to know the reason behind everything, and trying to find the answer to some curious questions like why our body cannot make food from carbon dioxide, water, and minerals like plants do, learning science will be fun for you. NCERT solutions therefore would be good tools to aid this interest of yours.

NCERT science textbook of class 9 will introduce you to four subjects physics, chemistry, biology, and environmental science. Natural resources, the laws of motion, force, gravity, sound, atoms, and molecules, tissues and cells are some topics taught in class 9 science. Knowing answers to the questions asked in the NCERT textbook is important to score marks. You could take the help of the NCERT solutions for class 9 science to get the answers. Scoring very good marks can now be a reality with the help of the CBSE  NCERT solutions of class 9 science. Along with science, NCERT solutions for class 9 maths could also be used to learn and perform well in maths exam.

## Weightage of marks for CBSE class 9 science

 Units Marks Unit 1: Matter - Its Nature and Behaviour 23 Unit 2: Organization in the Living World 20 Unit 3: Motion, Force and Work 27 Unit 4: Our Environment 06 Unit 5: Food; Food Production 04 Total + Internal assessment 80+20 Grand Total 100

## NCERT solutions for class 9 science- chapter wise

Matter is made of the particles. Here, you will learn how small are thees particle, physical properties matter, state of matter (solid, liquid and gas), changing of one state to another (melting, freezing, evaporation) and factor(temperature, pressure) that affecting the rate of changing state like(rate of melting, rate of freezing, rate of evaporation), etc. Evaporation is a surface phenomenon that means the rate of evaporation is also depends on the area of the surface of evaporation. Particles from the surface gain enough energy to overcome the forces of attraction present in the liquid and change into the vapor state. By clicking the above link, you will get NCERT solutions for class 9 science of chapter 1.

CBSE NCERT solutions for class 9 science chapter 2 Is Matter Around Us Pure This chapter is an advanced version of the chapter basic concept "Mixture" which you have studied in lower classes.  In this chapter, you will study the pure substance, different types of solutions(homogenous and heterogeneous solutions), properties of solutions,  mixtures, suspension and colloidal that exist around us. In another part of the chapter, you will also study different types of separation methods like crystallization, evaporation, etc. which can be used to separate the mixture into pure substances using appropriate separation techniques. In the solutions of NCERT for class 9 science of this chapter, you will get solved numerical problems too.

Molecules are an electrically neutral group made up of two or more atom held together from chemical bonds. Here, you will learn about the different types of molecules(molecules of elements, molecules of the compound) atoms, the law of mass and energy conservation, law of constant proportion and Dalton's atomic theory, etc. In CBSE NCERT solutions for class 9 science, you will learn how to write the chemical formula of a molecular compound, mole concept, the molecular mass of the compound, polyatomic ions(clusters of atoms that act as an ion), etc.

In the previous chapter, you have studied about the molecules which are made of a group of atoms. Here, you will learn about what is an atom and it's structure. Atom is the smallest component of any element that can't be further divided. Atom is made up of three sub-atomic particles protons, electrons, and neutrons. Protons are positively charged particles, electrons are negatively charged particles, and neutrons are electrically neutral particles. In CBSE NCERT solutions for class 9 science, you will also learn about different models of an atom, which are proposed by the different scientists.

All organisms that we look around us is made of cells. This is the fundamental unit of life. Robert Hooke was the first one to discover the cells in 1665. This chapter is related to the organization of living organisms that you have studied in the lower class. Here, you will study what is a cell made up of, the structure of the cell, functions of different cells and cell membranes, and the structural organization of the cell. Also, you will learn about different parts of cell-like cell walls, nucleus, cytoplasm, endoplasmic reticulum, Golgi apparatus, lysosomes, mitochondria(the powerhouse of the cell),   plastids, vacuoles, and cell division. The effect of hypotonic, hypertonic, and isotonic solutions on cell also cover in this chapter.

In the previous chapter, you have already learnt that in unicellular organisms, all functions are performed by single-cell but in multicellular organism cells are specialized to carry out the specific functions. Cells specialize in one function are grouped together and this cluster of cells called a tissue. This cluster of cells is arranged and designed so as to give the highest possible efficiency of function. The tissue is a group of cells similar in structure and function. Whereas plant cell and animal cells are different from each other. Plant tissues are of two main types - meristematic and permanent and animal tissues can be epithelial, connective, muscular and nervous tissue. Here, you will study different types of tissues, gourd cells, stem cells, etc.

When we see our surroundings, each organism is different from others to a lesser or greater extent. Aristotle was the first person to develop a classification of animals on the basis of living, whether on earth, in water, or in air. In this chapter, you will study that all living organisms are divided on the above bases into five kingdoms, namely Monera, Protista, Fungi, Plantae, and Animalia. Basically, the classification of life forms is related to their evolution. In the solutions of NCERT for class 9 science of this chapter, you will also learn about the systematic naming of all living organisms.

In our surroundings, we see some objects are in rest and some are in motion. We say an object is in motion when it positions change with time. Flying birds, swimming fish, and moving cars are some examples of the motion. Atoms, molecules, planets, stars, and galaxies are all in motion. It can be described in terms of the distance moved or the displacement. In the solutions of NCERT for class 9 science of this chapter, you will study displacement, different types of motion, uniform motion, non-uniform motion, circular motion, speed, velocity, acceleration, etc. The motion of an object could be uniform or non-uniform depending on whether its velocity is constant or changing.

In the previous chapter, you have already learnt about different types of motion. Now questions are that what causes the motion? Why does the speed of an object change with time? Do all motions require a cause? what is the nature of this cause? In the solutions of NCERT for class 9 science of this chapter, you will get the answers to all these questions. In this chapter, you will study three laws of motion that are given by Newton (Newton's law of motion), Galileo's concept momentum, rate of change of momentum, the net force on a body, etc. IN the CBSE NCERT solutions for class 9 science, you will learn the applications of Newton's law of motion.

In the previous chapter you have already learnt about the motion of objects and force on the object as the cause of motion. You know that force is needed to change the speed or direction of motion of the object. You must have observed that an object dropped from a height falls towards the earth. So, there must be a force by the earth on the object which attracts the object toward it. This force is called the gravitational force. Any two mass placed at a certain distance will experience gravitational force but it is a weak force unless large masses are involved. Gravitational force is always an attractive force between two masses. In the CBSE NCERT solutions for class 9 science, you will learn more about the gravitational force, and how to calculate it. Here, you will get to know that the force of gravity decreases with altitude. It also varies on the surface of the earth, decreasing from poles to the equator.

We need the energy to perform any activity like playing, singing, reading, writing, thinking, jumping, cycling or running. All living beings get this energy from food. Machines need fuel as energy to perform any activity. Work done on an object is defined as the magnitude of the force multiplied by the distance moved by the object in the direction of the applied force. In this chapter, you will learn the concept of work and energy, the relation between work and energy, different forms of energy(potential and kinetic energy). In the solutions of NCERT for class 9 science,  you will learn some applications of the work and energy. The unit of work is joule: 1 joule = 1-newton × 1 meter.

We hear sounds from various sources like humans, birds, bells, machines, vehicles, televisions, radios, mobile, etc. In the previous chapter, you have already learnt about mechanical energy. Sound is another form of energy like mechanical energy, light energy which produces a sensation of hearing in our ears. Sound is produced due to the vibration of different objects. In the solutions of NCERT for class 9 science of this chapter, you will get to know that the energy of the sound that travels and not the particles of the medium for the propagation of the sound. It will cover the sound production, propagation of sound, properties, and characteristics of the sound wave, speed of sound in different mediums, reflection of the sound wave, multiple reflections of the sound wave, applications of multiple reflections, reverberation, and application of ultrasound.

In chapter 5 and chapter 6 of class 9 science, you have learnt that cell is a fundamental unit of all organisms and specialized cells perform a specific function. All these activities are interconnected. Food is necessary for the proper functioning of cells and tissues. Anything that prevents the proper functioning of cells and tissues will lead to a lack of proper activity of the body. In the NCERT solutions for class 9 science of this chapter, you will learn about different types of diseases, the cause of diseases like infectious and which are non-infectious. Infectious diseases can be prevented by public health hygiene measures that reduce exposure to infectious agents.

The land, the water, air and energy from the sun are the most important natural resources that we have. Here, you will learn about the importance of natural resources and why we need to conserve them. Air, wind, rain, air pollution, water, water pollution, minerals in the soil, biogeochemical cycles, the water cycle, nitrogen cycle, carbon cycle, greenhouse effect, oxygen cycle, ozone layer and depleting of the ozone layer are the important topics that are covered in the solutions of NCERT for class 9 science of this chapter. Also, you will learn that the ozone layer which a very important factor to protect us from harmful Ultra-Violet rays that are coming from the sun and how chlorofluorocarbon(CFC) and other air pollutants are depleting the ozone layer.

As you know India is a very populous country, and we are still growing. As the population is growing, we need more food. As India is already intensively cultivated, so there is no scope for increasing the area of cultivation. Therefore, the only way is to increase our production is by the efficiency of crop production and livestock. By the green revolution, we have increased our food gain production. In the solutions of NCERT for class 9 science of this chapter, you will study those improvements which are required to be done in our food resources. In this chapter, you will also study different types of cultivation of crops for food purposes like horticulture, pisciculture, etc.

## NCERT solutions- class wise

Here some tips to effectively prepare for CBSE class 9 science

• You shouldn't refer to too many resources but instead stick to the syllabus provided by NCERT.
• You shouldn't be mugging up the concepts. A better way is to try to understand the concept clearly and relate with other concepts. Solutions of NCERT for class 9 science will help you to clear your fundamentals
• You should read and understand the portion that is taught on that day otherwise you may find difficulties in understanding the next concepts related to the topic
• Prepare some short notes at the time of reading the chapter, it will give you a better understanding of the concepts. You can also use these short notes for quick revision before the exam
• For the physics part, you should try the NCERT exercise questions. If you are unable to solve on your own, you can take help of these CBSE NCERT solutions for class 9 science which are provided here

Happy learning !!!

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