Pastoralists
24 Nov 2025

CLASS 9 HISTORY Chapter- Pastoralists in the Modern World | NOTES

PASTORALISTS Pastoralists are communities who move from place to place with their herds of animals like cattle, sheep, goats, camels, and yaks. Their lifestyle is also known as nomadic pastoralism. Their movement is not random — they follow a seasonal cycle, shifting to areas where fresh grass and water are available. This constant movement is called transhumance. PASTORAL NOMADS AND THEIR MOVEMENTS *In the Mountain Mountain regions in India are home to several pastoral communities. Their entire lifestyle revolves around the seasonal movement of people and animals in search of fresh grazing grounds. Pastoralists in the mountains cannot stay in one place throughout the year because of the following reasons: Therefore, mountain pastoralists move upwards in summer and downwards in winter. 1. The Gujjar-Bakarwals of Jammu & Kashmir 2. The Gaddi Shepherds of Himachal Pradesh 3. The Bhotiyas, Sherpas and Kinnauri *On the Plateaus, Plains & Deserts Pastoral communities are not found only in the mountains.Large groups live in the Deccan plateau, the plains of north India, and the hot deserts of Rajasthan. Just like mountain herders, they too depend on seasonal changes, monsoon cycles, and availability of water and grass. 1. In the Plateaus – The Dhangars of Maharashtra 2. In the Plains – Pastoralists of Punjab, Haryana & Western UP 3. In the Deserts – The Raikas of Rajasthan COLONIAL RULE AND PASTORALISTS’ LIFE Before British rule, pastoralists moved freely with their herds across forests, plains, mountains, and deserts.But when the colonial government took control, their lifestyle changed completely. *Major Changes faced by pastoralists: *How Did the Pastoralists Cope with These Changes? PASTORALISM IN AFRICA Africa has the highest number of pastoralists in the world. The majority of the continent has dry terrain, seasonal rainfall, and little vegetation, giving pastoralism an important way of life. Some well-known Pastoral Groups of Africa include: They rear animals such as cattle, goats, camels, sheep, and depend on them for food, trade, and survival. *The Maasai: A Well-Known Pastoral Community The Maasai of Kenya and Tanzania are one of the most famous pastoral groups in the world. Traditional Life of the Maasai: Impact of Colonial Rule on the Maasai:

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Climate
22 Nov 2025

CLASS 9 GEOGRAPHY Chapter-4 CLIMATE | NOTES

Weather Vs Climate Before studying India’s climate, it is important to understand two basic terms: weather and climate. Weather tells us what the atmosphere is like right now, while climate tells us what the atmosphere of a place is like most of the time over many years. For example: The Difference between Weather and Climate are as follow: Weather Climate Weather is the day-to-day condition of the atmosphere of a place. Climate is the average weather pattern of a place over 30–40 years. It can change quickly – within minutes or hours. It changes very slowly over a long period. Includes daily changes in temperature, rainfall, humidity, wind, etc. Shows long-term patterns like hot/dry climate, cold/wet climate, etc. Describes the atmosphere at a particular time. Describes the general atmospheric conditions of a place for many years. Example: Today it is sunny, tomorrow it may rain. Example: Rajasthan has a hot, dry climate; Kerala has a hot, wet climate. Helpful for short-term planning (clothes for the day, carrying an umbrella). Helpful for long-term planning (crop selection, construction, tourism). *Elements of Weather and Climate 1. Temperature 2. Atmospheric Pressure 3. Wind 4. Humidity 5. Precipitation (Rainfall, Snow, Hail) India’s Climate: Monsoon Type The term monsoon comes from the Arabic word “mausim”, meaning season. This tells us that monsoons are seasonal winds that bring major changes in temperature and rainfall. India is known for its monsoon type of climate, which makes our weather pattern very different from many other countries. * Why is India’s Climate Called Monsoon Type? India receives most of its rainfall from seasonal winds—the Southwest Monsoon and Northeast Monsoon.These winds reverse their direction depending on the season, leading to very clear changes in India’s climate. *Key Features of India’s Monsoon Type Climate FACTORS AFFECTING INDIA’s CLIMATE 1. Latitude Latitude means how far a place is from the Equator. 2. Altitude (Height Above Sea Level) Temperature decreases with height.For every 165 m rise in altitude, temperature drops by 1°C. So, higher places are always cooler. 3. Distance from the Sea The sea affects the climate of nearby areas. 4. Mountain Barriers Mountains play a major role in controlling temperature, wind, and rainfall. Himalayas 5. Pressure and Wind Systems The movement of air (winds) depends on pressure conditions. 6. Upper Air Circulation (Jet Streams) Jet streams are fast-moving winds in the upper atmosphere. 7. Ocean Currents Ocean currents are continuous flows of warm or cold water in the oceans. This affects the temperature and sometimes rainfall of coastal areas. THE SEASONS India’s climate is known for its different seasonal patterns. Unlike many other nations, which have simply summer and winter, India has a strongly seasonal climate due to the monsoon system and its tropical-subtropical position. The Indian Meteorological Department (IMD) divides the year into four major seasons: 1. The Cold Weather Season (Winter) – December to February 2. The Hot Weather Season (Summer) – March to May 3. The Advancing Monsoon Season – June to September 4. The Retreating Monsoon Season – October to November DISTRIBUTION OF RAINFALL IN INDIA Rainfall in India varies throughout the country. Some areas have heavy rainfall, while others receive very little. This uneven or irregular pattern is known as distribution of rainfall. 1. Areas of Heavy Rainfall (More than 200 cm annually) 2. Areas of Moderate Rainfall (100–200 cm annually) 3. Areas of Low Rainfall (Less than 100 cm annually) 4. Regions of Very Low Rainfall (Below 25 cm annually) MONSOON AS A UNIFYING BOND India has a huge variety of climates, landforms, languages, and cultures, the monsoon binds the whole country together.It is one of the most important features of India’s climate and affects almost every part of the nation. There are some reasons that shows that Monsoon is a Unifying Force: 1. Seasonal Rhythm Shared by Entire Country The monsoon follows a distinct seasonal pattern—the arrival, progress, and withdrawal of rains. This pattern is felt across India, giving people everywhere a common climatic experience. 2. Whole Country Awaits Its Arrival Every year, after the intense summer heat, the entire nation waits for the monsoon.The excitement of the first rain is felt from Kerala to Kashmir and from Gujarat to Assam. 3. Monsoon Affects Agriculture All Over India India’s agriculture is heavily monsoon-dependent. The monsoon influences the whole economy, connecting all regions. 4. Water Availability Everywhere Depends on Monsoon Rivers, lakes, ponds, and groundwater are mainly recharged by monsoon rainfall. So, all states rely on monsoon rains. 5. Monsoon Creates a Sense of Cultural Unity Many festivals, songs, and traditions in India are linked to the monsoon. This gives India a shared cultural identity during the rainy season. 6. Monsoon Winds Cover the Entire Subcontinent The Southwest Monsoon and the Retreating Monsoon touch almost every part of India

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Gravitation
8 Nov 2025

CLASS 9 SCIENCE Chapter- Gravitation | NOTES

INTRO- GRAVITATION –Gravitation is a natural phenomenon by which every object in the universe attracts every other object with a force that acts along the line joining their centres. -This force of mutual attraction between two masses is called the gravitational force. -Everybody that has mass exerts an attractive force on every other body in the universe. -The magnitude of this force depends on: #The greater the masses, the stronger the attraction; the larger the distance, the weaker the force. -The idea of gravitation was explained by Sir Isaac Newton in 1687. (He discovered that the same force that causes an apple to fall to the ground also holds the Moon in orbit around the Earth and the planets in orbit around the Sun. This inspired him to create the Universal Law of Gravitation, which mathematically defines the force.) *Nature of the Gravitational Force    Property                                                        Description Type of Force Non-contact (acts without physical contact) Direction Always acts along the line joining the centres of two bodies Nature Always attractive, never repulsive Range Infinite (though becomes very weak with distance) Strength Weak compared to other fundamental forces (e.g., electromagnetic) *Difference Between Gravitation and Gravity Basis Gravitation Gravity Definition The universal force of attraction between any two bodies in the universe. The gravitational force specifically exerted by the Earth on objects near its surface. Scope Universal – acts between any two masses. Local – acts only near the Earth. Example Attraction between the Sun and Earth. Attraction between Earth and an apple. Newton’s Universal Law of Gravitation Newton’s Universal law of gravitation states that every object in the universe attracts every other object with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres. Let two objects of masses m1 and m2 be separated by a distance . Then, according to Newton’s law, To remove proportionality, a constant G (the universal gravitational constant) is introduced:                                                                   Where, G = 6.67×10-11 Nm2/kg2 *Relation between Newton’s third law of motion and Newton’s law of gravitation -Newton’s third law of motion: According to Newton’s third law of motion, “Every object exerts equal and opposite force on other object but in opposite direction.” –Newton’s law of gravitation: According to Newton’s law of gravitation, “Every mass in the universe attracts every other mass.” In case of freely falling stone and earth, stone is attracted towards earth means earth attracts the stone. But according to Newton’s third law of motion, the stone should also attract the earth.It is true that stone also attracts the earth with the same force F = m × a but due to very less mass of the stone, the acceleration (a) in its velocity is 9.8 m/s2 and acceleration (a) of earth towards stone is 1.65×10-24 m/s2 which is negligible and we cannot feel it. *Importance of Universal Law of Gravitation FREE FALL OF AN OBJECT AND ACCELERATION DUE TO GRAVITY Free fall is the motion of a body when it falls towards the Earth under the influence of gravitational force only, with no other force (like air resistance) acting on it. When an object is thrown upward, it reaches certain height, then it starts falling down towards earth. It is because the earth’s gravitational force exerts on it. This fall under the influence of earth is called ‘free fall of an object’. During this free fall direction do not change but velocity continuously changes which is called acceleration due to gravity. It is denoted by ‘g’. Its unit is same as acceleration m/s2. *Derivation for Acceleration Due to Gravity From Newton’s law of gravitation: According to Newton’s second law of motion: For a freely falling body: Equating both forces: Cancelling m from both sides: Formula: *The Value of acceleration due to gravity (g) where, *Difference Between Gravitational constant (G) and Acceleration due to gravity (g) Basis of Difference Universal Gravitational Constant (G) Acceleration Due to Gravity (g) 1. Definition It is a constant that measures the strength of the gravitational force between any two bodies in the universe. It is the acceleration produced in a body when it falls freely under the influence of Earth’s gravity. 2. Formula 3. Nature It is a universal constant, same everywhere in the universe. It varies from place to place (depends on height, depth, and latitude). 4. Value G= 6.67×10-11  5. Depends On It does not depend on mass, distance, or location. It depends on the mass and radius of the Earth. 6. Type of Quantity Scalar quantity (has only magnitude). Vector quantity (has magnitude and direction — toward Earth’s center). 7. Symbol G g 8. Unit N·m²/kg² m/s² 9. Discovery Discovered by Sir Isaac Newton. Measured experimentally on Earth. 10. Variation Remains constant throughout the universe. Decreases with altitude and depth; increases at poles. *Equations of Motion for a Freely Falling Body The same kinematic equations apply, replacing a by g: #For Object Falling Downward #For Object Thrown Upward *Factors Affecting the Value of g MASS AND WEIGHT *MASS *WEIGHT *Difference Between Mass and Weight Basis Mass Weight Definition Amount of matter contained in a body. Force with which Earth attracts a body towards its center. Formula m=w/g W = mg Nature Scalar quantity. Vector quantity (acts downward). Unit (SI) Kilogram (kg). Newton (N). Value Constant everywhere. Varies from place to place (depends on (g)). Measuring Instrument Beam balance. Spring balance. Zero Condition Never zero (matter cannot vanish). Becomes zero where (g = 0) (e.g., space). On Moon Same as on Earth. 1/6 of weight on Earth. THRUST AND PRESSURE When a force acts perpendicularly on a surface, it creates an effect known as thrust.The effect of thrust per unit area on a surface is called pressure. *Thrust *Pressure *Examples of Pressure BUYONCY The upward force exerted by a liquid (or fluid) on an object when it is partially or completely immersed in it is called buoyant force, and the property of a fluid to exert this upward force is called buoyancy. It…

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8 Oct 2025

CLASS 9 ECONOMICS Chapter-3 POVERTY AS A CHALLENGE

Introduction – Poverty as a Challenge Class 9 One of India’s most significant social and economic problems is poverty. It describes a state where people are lacking the basic necessities of life, such as food, clothing, housing, medical treatment, and education. Every day, a poor person fights for survival and faces insecurity, hunger, and a lack of dignity. Poverty includes not only a lack of money, but also the absence of opportunities, social position, and a fair level of living. Meaning of Poverty Poverty is a circumstance in which a person’s income is insufficient to meet their basic needs.It has a wide-ranging impact on life: Thus, poverty is multidimensional, not just about income, but also about quality of life. Two Typical Cases of Poverty 1. RURAL CASE- Ram Saran’s Family (Village near Meerut, Uttar Pradesh) -Living Conditions: -Conclusion (Rural Poverty Features) 2. URBAN CASE – Saviya Begum’s Family (Urban Area) -Living Conditions: -Conclusion (Urban Poverty Feature) #NOTE: POVERTY AS SEEN BY SOCIAL SCIENTISTS According to social scientists, poverty is about more than just income or money. It is a multidimensional issue that include a lack of basic necessities, education, healthcare, and social justice. Poverty means a situation where people are deprived of a decent standard of living and opportunities for development. Social scientists identify different types of deprivations faced by poor people. These are as follow: (i) Social Deprivation: (ii) Economic Deprivation: (iii) Political Deprivation: (iv) Health and Educational Deprivation: (v) Vulnerability and Insecurity: POVERTY LINE The poverty line is the minimum amount of income or consumption necessary for a person to achieve their basic necessities. People below this level are considered poor. The Planning Commission and the National Sample Survey Organisation (NSSO) conducted the survey. The poverty line is estimated periodically (normally every five years). In India, the poverty line is estimated based on: POVERTY ESTIMATES Poverty estimates show how many people are poor in the country. The Planning Commission of India calculates them based on National Sample Survey Organisation (NSSO) surveys. In India, the consumption approach is mostly used to determine if people can afford basic food and necessities. Historical estimations suggest a falling trend in poverty: Poverty has gradually declined, with rural areas having more poor people than urban areas. –Limitations of Poverty Estimates INTER STATE POVERTY Inter-state disparities refer to differences in poverty levels and living standards between India’s states. These disparities exist because not all states have equal resources, industries, and opportunities. -Lower Poverty States: States like Maharashtra, Gujarat, Punjab, Haryana, Kerala, and Tamil Nadu have lower poverty rates due to better industrial growth, improved agriculture, higher literacy rates, and better job opportunities. -Higher Poverty States: States such as Bihar, Uttar Pradesh, Odisha, Madhya Pradesh, and Jharkhand continue to have higher poverty rates due to slow industrial growth, poor infrastructure, low literacy, and a lack of job opportunity. -The main causes of inter-state disparities include: #NOTE: Rural poverty is higher than urban poverty in all states. Disparities affect standard of living, health, and education of people. GLOBAL POVERTY SCENARIO The global poverty scenario describes the extent and distribution of poverty around the world. According to the World Bank, a person earning less than $1.90 per day (in terms of purchasing power) is classified as poor under international standards. Global poverty has decreased in recent decades, particularly since the 1980s, although it remains a serious problem in many developing and undeveloped countries. The largest concentration of poor people lives in South Asia (India, Bangladesh, Nepal, Pakistan, Sri Lanka) and Sub-Saharan Africa. The global poverty scenario shows that, while poverty has decreased worldwide, it is still concentrated in South Asia and Africa. Countries such as China and India have made great progress. POVERTY AND SUSTAINABLE DEVELOPMENT GOALS (SDG) -In 2015, the United Nations approved the Sustainable Development Goals (SDGs), which aim to promote global peace, prosperity, and equality by 2030. Goal 1 – “No Poverty” aims to end all types of poverty and ensure that no one lives on less than $1.90 per day (international poverty line). -Poverty reduction is an important component of sustainable development since it improves education, health, equality, and economic progress. -India is committed to achieving this goal through various poverty alleviation programmes, such as: CAUSES OF POVERTY ANTI-POVERTY MEASURES To reduce poverty in India, the government has adopted two main approaches: *Promotion of Economic Growth *Targeted Anti-Poverty Programmes The government has launched several schemes to directly help the poor: 1. Mahatma Gandhi National Rural Employment Guarantee Act (MGNREGA), 2005 2. National Rural Employment Guarantee Programme (NREGP) and National Food for Work Programme (NFFWP) 3. Pradhan Mantri Awas Yojana (PMAY) 4. Pradhan Mantri Gram Sadak Yojana (PMGSY) 5. National Rural Livelihood Mission (NRLM) 6. Prime Minister Jan-Dhan Yojana (PMJDY) THE CHALLENGES AHEAD Even after years of economic growth and government schemes, poverty remains a challenge in India. These Challenges are as follow: 1. Rural Poverty 2. Unemployment and underemployment 3. Population Pressure 4. Social Inequality 5. Lack of Education and Skills 6. Regional Disparities 7. Implementation Issues

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class 9 science structure of atom notes
4 Oct 2025

CLASS 9 SCIENCE (Chemistry) Chapter-4 STRUCTURE OF ATOMS

CHARGED PARTICLES IN MATTER The presence of charged particles in matter is suggested by the phenomena of static electricity and electricity conduction through certain substances.   Therefore, Atoms can be divided further into sub-atomic particles. *SUB-ATOMIC PARTICLES An atom is the smallest unit of an element that still retains its chemical properties. It consists of three fundamental sub-atomic particles: Electrons (e−): These are the negatively charged particles having very little mass. They orbit the nucleus. Protons (p+): These are the positively charged particles. They are located in the nucleus and have a mass of about one atomic mass unit. Neutrons (n): These are the particles that are neutral (have no charge). They are also found in the nucleus and have a mass roughly equivalent to that of a proton. EARLY MODELS OF ATOM *DALTON’S ATOMIC THEORY Dalton’s theory states that matter is made up of small indestructible atoms that combine in set ratios and rearrange in reactions without being created or destroyed. This theory suggested that Atom is indivisible – which could not be broken down into smaller particles. # But the discovery of Sub-Atomic Particles inside the atom disproved this principle of Dalton’s atomic theory. *DISCOVERY OF ELECTRONS (1897) -Given by: J.J. Thomson in 1897. -J.J. Thomson discovered the electron in 1897 through the cathode ray experiment, proving atoms are not indivisible. -Experiment Setup -Key Observations -Conclusion -Thomson’s Contribution -Characteristics of an Electron *DISCOVERY OF PROTON -Given by: E. Goldstein in 1886 –E. Goldstein discovered protons in 1886 through canal rays, identifying them as positively charged particles inside atoms. -Experiment Setup -Key Observations -Conclusion -Importance -characteristics of proton *DISCOVERY OF NEUTRON – Given by: James Chadwick -In 1932, James Chadwick discovered the neutron, a neutral particle in the nucleus with mass equal to a proton. -Experiment Key Observations -Conclusion -Importance -Characteristics of Neutron ATOMIC MODEL There are three Atomic Models on Arrangement of Sub-Atomic Particles. 1) Thomson’s Model of the Atom (1898) -After discovering the electron, J.J. Thomson proposed a model to explain the structure of the atom. -Thomson imagined the atom as a sphere of positive charge with electrons studded inside it, called the Plum Pudding Model. -Main Features -Limitations -Importance 2) Rutherford’s Model (Nuclear Model) -Rutherford performed the Gold Foil Experiment (α-particle scattering experiment) with Geiger and Marsden. -Aim: To test Thomson’s Plum Pudding Model. -Experiment Setup -Observations -Main Features of Rutherford’s Model -Limitations -Importance 3) Bohr’s Model -Niels Bohr improved Rutherford’s model. -Solved the stability problem and explained hydrogen spectrum. -Postulates of Bohr’s Model -Achievements –Limitations Atomic Number and Mass Number An atom is made up of subatomic particles: protons, neutrons, and electrons. The atomic number and mass number are two important terms used to describe the composition of an atom. *Atomic Number (Z) The atomic number, symbolized by Z, is the number of protons in the nucleus of an atom. Formula: Atomic Number(Z)=Number of Protons For a neutral atom: Number of Electrons=Number of Protons *Mass Number (A) The mass number, symbolized by A, is the total number of protons and neutrons in the nucleus of an atom. Since the mass of electrons is negligible, the mass number essentially represents the total mass of the atom’s nucleus. Formula: Mass Number(A)=Number of Protons + Number of Neutrons You can rearrange this formula to find the number of neutrons: Number of Neutrons = Mass Number(A) – Atomic Number(Z) *Isotope Notation Elements are often represented with their atomic and mass numbers. The notation is as follows: Where: Example: Carbon (C) A common isotope of carbon has an atomic number of 6 and a mass number of 12. This can be written as: Electron Distribution in Orbits After the discovery of protons, electrons, and neutrons, the next task was to understand how electrons are arranged within an atom. -Niels Bohr and Bury developed laws for the distribution of electrons in different shells (orbits/energy levels) surrounding the nucleus. *Rules for Electron Distribution 1. Naming of Shells 2. Maximum Number of Electrons in a Shell 3. Octet Rule (Stability Rule) 4. Filling of Electrons in Successive Shells *Importance of Electron Distribution VALENCY Valency is the combining capacity of an atom. It is the number of electrons an atom must gain, lose, or share to achieve a stable electronic configuration, typically having a full outermost shell (an octet of 8 electrons, or a duplet of 2 for elements like Helium). This stable state resembles the electronic configuration of a noble gas. -Atoms are stable when they have 8 electrons in their outermost shell (Octet Rule). -To become stable, atoms: *How to Determine Valency The valency of an element is determined by the number of electrons in its outermost shell, known as valence electrons. *Types of Valency Based on how atoms achieve stability, we can distinguish between two types of valency: *Noble Gases: Zero Valency Noble gases (Group 18 elements) like Helium, Neon, and Argon have a completely filled outermost shell (a stable octet or duplet). Because they are already stable, they do not need to gain, lose, or share electrons. #Valency of noble gases is zero. They are generally unreactive. *Importance of Valency ISOTOPES AND ISOBARS *Isotopes -Definition – Characteristics – Example: Chlorine has two isotopes, Chlorine-35 and Chlorine-37. – Uses of Isotopes *Isobars – Definition – Characteristics

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