20% of Earth’s oxygen is produced by the Amazon rainforest

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Our atmosphere is made up of roughly 78 per cent nitrogen and 21 per cent oxygen, with various other gases present in small amounts. The vast majority of living organisms on Earth need oxygen to survive, converting it into carbon dioxide as they breathe. Thankfully, plants continually replenish our planet’s oxygen levels through photosynthesis. During this process, carbon dioxide and water are...

The Eiffel Tower can be 15 cm taller during the summer

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When a substance is heated up, its particles move more and it takes up a larger volume – this is known as thermal expansion. Conversely, a drop in temperature causes it to contract again. The mercury level inside a thermometer, for example, rises and falls as the mercury’s volume changes with the ambient temperature. This effect is most dramatic in gases but...

Babies have around 100 more bones than adults

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Babies have around 100 more bones than adults Babies have about 300 bones at birth, with cartilage between many of them. This extra flexibility helps them pass through the birth canal and also allows for rapid growth. With age, many of the bones fuse, leaving 206 bones that make up an average adult skeleton.

Sociology Class XII Syllabus

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Sociology Class XII Syllabus Exam Structure Unit Topic Marks A. Indian Society 32 1  Introducing Indian Society (Non-evaluative) -  2  Demographic Structure & Indian Society 6 3  Social Institutions-Continuity and change 6  4  Market as a Social Institution 6  5  Pattern of Social Inequality and Exclusion 6  6  Challenges of Cultural Diversity 8  7  Suggestions for Project Work (Non-evaluative) -  B. Change and Development in Indian Society 48  8  Structural Change 6  9  Cultural Change 6  10  The Story of Democracy 6  11  Change and Development in Rural Society 6  12  Change and Development in Industrial Society 6  13  Globalization and Social Change 6  14  Mass Media and Communications 6  15  Social Movements 6    Total 80 A. INDIAN...

Psychology Class XII Syllabus

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Psychology Class XII Syllabus Exam Structure Unit Topic Marks I Variations in Psychological Attributes 9 II Self and Personality 10 III Meeting Life Challenges 7 IV Psychological Disorders 10 V Therapeutic Approaches 7 VI Attitude and Social Cognition 8 VII Social Influence and Group Processes 7 VIII Psychology and Life 6 IX Developing Psychological Skills 6   Total 70 Unit-I: Variations in Psychological Attributes Introduction Individual Differences in Human Functioning Assessment of Psychological Attributes Intelligence Theories of Intelligence Theory of Multiple Intelligences Triarchic Theory of Intelligence Planning, Attention-arousal, and Simultaneous successive Model of Intelligence Individual...

Political Science Class XII Syllabus

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Political Science Class XII Syllabus Exam Structure Part A: Contemporary World-Politics (50 Marks) Unit  Topic  Marks  1  Cold War Era  14   2  The End of bipolarity  3  US Hegemony in World Politics  16   4 Alternative centres of Power 5 Contemporary South Asia 6 International Organizations 10   7 Security in Contemporary World 8 Environment and Natural Resources 10   9 Globalisation   Total 50 Part B: Politics in India since Independence Unit  Topic  Marks  10  Challenges of Nation-Building  16   11  Era of One-Party Dominance  12  Politics of Planned Development  13 India’s External Relations 6  14 Challenges to the Congress System 12   15 Crisis of the Democratic order 16 Rise of Popular Movements 16   17 Regional Aspirations 18 Recent...

Physics Class XII Syllabus

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Physics Class XII Syllabus Exam Structure Unit Chapter / Topic Marks I Electrostatics 15      Chapter-1: Electric Charges and Fields   Chapter-2: Electrostatic Potential and Capacitance II Current Electricity   Chapter-3: Current Electricity III Magnetic Effect of Current & Magnetism 16     Chapter-4: Moving Charges and Magnetism   Chapter-5: Magnetism and Matter IV Electromagnetic Induction & Alternating Current   Chapter-6: Electromagnetic Induction   Chapter-7: Alternating Current V Electromagnetic Waves 17     Chapter-8: Electromagnetic Waves VI Optics   Chapter-9: Ray Optics and Optical Instruments   Chapter-10: Wave Optics VII Dual Nature of Matter 10     Chapter-11: Dual Nature of Radiation and Matter VIII Atoms & Nuclei   Chapter-12: Atoms   Chapter-13:...

Mathematics Class XII Syllabus

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Mathematics Class XII Syllabus Exam Structure Unit Topic Marks I. Relations and Functions 10 II. Algebra 13 III. Calculus 44 IV. Vectors and 3-D Geometry 17 V. Linear Programming 06 VI. Probability 10   Total 100 Unit I: Relations and Functions 1. Relations and Functions Types of relations: reflexive, symmetric, transitive and equivalence relations. One to one and onto functions, composite functions, inverse of a function. Binary operations. 2. Inverse Trigonometric Functions Definition, range, domain, principal value branch. Graphs of inverse trigonometric functions. Elementary properties of inverse trigonometric functions. Unit II:...