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Chapter 16 Garbage in, Garbage out ========================================================= Exercises from textbook Additional Exercises Tables from Textbook Activities/Projects Additional Exercises Choose the correct answer: 1-     Which of the following is a non-biodegradable waste a.     Broken plastic toy (√) b.     Pencil shavings c.      Leaves and twigs d.     Food waste 2-     Which of the following is not a non-biodegradable waste a.     Aluminium foil b.     Toffee wrapper c.      Fruit peel (√) d.     Broken glassware 3-     Which of the following is not true in case of plastic materials: a.     They are water proof b.     They are light weight and durable c.      They can be recycled d.     They are biodegradable (√) 4-     Which of the following is not to be done to reduce plastic waste: a.     Carrying a cloth bag b.     Using steel bottles c.      Insisting shopkeeper to give plastic bags (√) d.     Carrying o

Chapter 15 Air Around us ========================================================= Exercises from textbook Additional Exercises Tables from Textbook Activities/Projects Additional Exercises Choose the correct answer: 1-     When do you notice the presence of air? a.     Leaves of trees rustle b.     Clothes hanging on cloth-line sway c.     Pages of an open book flutter d.     All the above (√) 2-     Moving air makes it possible to a.     Fly kite b.     Separate sand and saw dust by winnowing c.     Both a and b (√) d.     None of the above 3-     Our earth is surrounded by a thin layer of air called a.     core b.     Atmosphere (√) c.     Ecosystem d.     Crust 4-     The component of air which takes up nearly four-fifth of the space that air fills a.     Nitrogen (√) b.     Oxygen c.     Argon d.     Smoke and dust 5-     Plants use this gas for respiration. a.     Carbon dioxide b.     Agron c.     Oxyge