Science and Sports
Class 9 Physical Education · Khel Praveen · Chapter 2
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- Science: 27 marks in Unit I, the biggest unit
- Maths: 25 marks in Geometry, 20 in Algebra
- Maths: 11 identities and 12 circle theorems
- English: 7 grammar topics, worth 10 marks
- Science: 16 traps corrected, 20 charts
- 12-question test at the end of every kit
- And dozens more key concepts and facts
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- 25 marks: Geometry, in both parts
- 20 marks Algebra, 14 Mensuration, 10 Data
- 11 identities and 12 circle theorems
- 9 quadrilateral theorems, all 7 solids
- Formulas not to mix up, listed
- 12-question test in both kits
- And dozens more key concepts and formulas
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- 27 marks: Unit I, cells to reproduction
- 25 marks: Unit II, mixtures to bonding
- 16 traps, corrected
- 23 marks: Unit III, motion to sound
- Formula cards for every law and number
- Motion graphs and how to read them
- And dozens more key concepts and formulas
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- 25 marks: Circles, in Unit IV Geometry
- 20 marks: linear polynomials, Unit II Algebra
- Ch 7: probability and its traps
- 14 marks: Mensuration, Heron and Brahmagupta
- 8 chapters of worked numericals
- Ten must-know facts on the first page
- And dozens more key concepts and formulas
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- 25 marks: Quadrilaterals, Unit IV Geometry
- 20 marks: linear equations in two variables
- Common traps that cost marks, listed
- 14 marks: surface area and volume
- 10 marks: combined and weighted averages
- Formulas you must not mix up, listed
- And dozens more key concepts and formulas
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- Timelines from early humans to 1000 CE
- Article numbers for democracy and elections
- Common traps that cost marks, listed
- Comparison tables built from the book
- Plate tectonics and landforms, Ch 1–2
- Ten must-know facts on the first page
- And dozens more key concepts and facts
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- 20 marks: Section B writing formats
- 10 marks: the 7 grammar topics of the paper
- Common traps that cost marks, listed
- 8 units: summaries and characters of each
- Idioms and expressions in one place
- Ten must-know facts on the first page
- And dozens more key concepts and facts
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- 20 अंक: खंड घ रचनात्मक लेखन formats
- समास and उपसर्ग-प्रत्यय rules in one place
- अर्थ के आधार पर वाक्य-भेद, with मुहावरे
- लेखक-परिचय, सार and पात्र for each पाठ
- 12 भूलें students make
- 12 प्रश्न final test with answers
- And dozens more key concepts and facts
Summary
This unit looks at sport through the lens of science, explaining how the human body works during movement and how that knowledge helps us train smarter and stay healthy. It introduces anatomy (the structure of the body) and physiology (how it functions), then surveys the systems that power activity: the skeletal system of bones that gives the body its frame and protects organs; the muscular system that produces force and movement; and joints, which are classified by how much they move (for example, the freely moving ball-and-socket and hinge joints). It explains the cardiovascular system — the heart, blood and vessels that circulate oxygen and nutrients — and the respiratory system, including how breathing supplies oxygen for cellular respiration, the process by which cells release energy from food. The unit also introduces the idea of levers in the body, showing how bones, joints and muscles act together like simple machines to generate strength and power. Students are encouraged to observe their own actions — kicking or throwing a ball — to identify the muscles and joints involved. Finally it compares the short-term and long-term effects of exercise on the body and stresses the importance of proper warm-up, cool-down and breathing, so that training is both effective and safe.