Pathik — CBSE Class 6–12 Notes, Worksheets & MCQ Quizzes

  Chapter 11: Nature’s Treasures Worksheet   A. Multiple Choice Questions  1. Which of the following is a natural resource? (a) Plastic (b) Machine (c) Water (d) Computer Answer: (c) Water 2. Which gas is present in the largest amount in air? (a) Oxygen (b) Nitrogen (c) Carbon dioxide (d) Argon Answer: (b) Nitrogen 3. Approximately what percentage of air is oxygen? (a) 78% (b) 50% (c) 21% (d) 1% Answer: (c) 21% 4. Moving air is called: (a) Wind (b) Cloud (c) Vapour (d) Breeze Answer: (a) Wind 5. Which of the following is a source of freshwater? (a) Sea (b) Ocean (c) River (d) Saltwater lake Answer: (c) River 6. Which device uses sunlight to produce electricity? (a) Windmill (b) Solar panel (c) Water pump (d) Bicycle Answer: (b) Solar panel 7. Forests are important because they: (a) Reduce biodiversity (b) Provide habitat to many organisms (c) Produce machines (d) Increase pollution Answer: (b) Provide habitat to many organisms 8. Soil is formed mainly through the: ...

  Chapter 11: Nature’s Treasures 1. Nature’s Treasures Nature provides everything essential for life, such as: Air Water Sunlight Forests Soil Rocks and minerals Fossil fuels All living beings depend on these natural resources for survival. Therefore, they should be used carefully and responsibly . 2. Air Air is a mixture of gases . Main components of air: Nitrogen – 78% Oxygen – 21% Argon, carbon dioxide and other gases – 1% Oxygen is essential for the survival of most living beings. Moving air is called wind. Wind may be gentle like a breeze or strong like a storm . Wind energy can be used in windmills to: Generate electricity Pump water Run flour mills 3. Water Water is essential for: Drinking Cooking Bathing Washing and cleaning Growing crops Industries Freshwater and Saline Water About two-thirds of Earth's surface is covered by water. Most water is in oceans and seas and is saline (salty) . Freshwater is found in: Rivers and lakes Ponds and wells Ice sheets and snow Under...

  CHAPTER 10 LIVING CREATURES: EXPLORING THEIR CHARACTERISTICS WORKSHEET A. Multiple Choice Questions  1. Which of the following is a characteristic of living beings? (a) They never grow (b) They respire (c) They never reproduce (d) They do not respond to changes Answer: (b) They respire 2. Which process involves taking in and giving out air? (a) Excretion (b) Reproduction (c) Breathing (d) Growth Answer: (c) Breathing 3. Which part of a plant helps in the exchange of gases? (a) Roots (b) Flowers (c) Stomata (d) Fruits Answer: (c) Stomata 4. Which of the following is an example of a response to a stimulus? (a) A stone remaining still (b) Touch-me-not folding its leaves when touched (c) A book lying on a table (d) A chair remaining in a room Answer: (b) Touch-me-not folding its leaves when touched 5. What is the process by which living organisms produce young ones of their kind? (a) Respiration (b) Reproduction (c) Excretion (d) Germination Answer: (b) Reproduction 6. Whic...

  Chapter 10 Living Creatures: Exploring Their Characteristics 1. Living and Non-living Things Things around us can be classified as living and non-living . Living beings show certain common characteristics: Movement Nutrition (need food) Growth Respiration Excretion Response to stimuli Reproduction Death A car can move, but movement alone does not make something living. Plants also show movement even though they do not move from one place to another. For example, flowers open and insectivorous plants such as Drosera show movement.  2. Characteristics of Living Beings A. Movement Living beings show movement. Animals can move from one place to another. Plants also show movement: Flowers open. Drosera traps insects by movement of its leaves. Climbers wind around nearby objects. Therefore, movement does not always mean moving from one place to another.  B. Growth Living beings grow and increase in size. For example, a child becomes larger as they grow. Plants and other l...

  Chapter 9 Methods of Separation in Everyday Life Worksheet  A. Multiple Choice Questions 1. Which method is used to separate unwanted stones from rice? (a) Filtration (b) Handpicking ✅ (c) Evaporation (d) Churning Answer: (b) Handpicking 2. Threshing is mainly used to separate: (a) Salt from water (b) Cream from milk (c) Grains from stalks ✅ (d) Oil from water Answer: (c) Grains from stalks 3. Which method uses wind to separate lighter components from heavier components? (a) Winnowing ✅ (b) Sieving (c) Filtration (d) Decantation Answer: (a) Winnowing 4. Sieving is based mainly on the difference in: (a) Colour (b) Size of particles ✅ (c) Taste (d) Smell Answer: (b) Size of particles 5. Salt can be obtained from seawater by: (a) Handpicking (b) Filtration (c) Evaporation ✅ (d) Magnetic separation Answer: (c) Evaporation 6. The process in which heavier insoluble particles settle at the bottom is called: (a) Sedimentation ✅ (b) Churning (c) Winnowing (d) Sieving Answe...

    Chapter 9: Methods of Separation in Everyday Life 1. Introduction – Why Do We Separate Substances? In our daily life, we often find two or more substances mixed together . Sometimes we need to separate them because: We want to obtain a useful component from a mixture. We want to remove an unwanted component . We want to make a substance suitable for use or consumption . Examples Removing stones from rice or pulses. Separating husk from grains. Removing tea leaves from tea. Separating salt from seawater. Separating butter from curd. Removing iron pieces from waste using a magnet. A mixture contains two or more substances mixed together. 2. Handpicking Meaning Handpicking is the method of separating substances by picking them out by hand from a mixture. It is generally based on differences in: Size Colour Shape When is handpicking useful? It is convenient when: The unwanted particles are present in small quantities . The particles can be easily seen and picked by hand . E...