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Q1. Robert Hooke's microscope, used in 1665, could make things appear about how much bigger than what the unaided eye could see?
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Q2. To observe sub-cellular components inside a cell, the chapter says we need a microscope with very high magnification. An electron microscope can magnify a cell about
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Q3. A low-cost foldable paper microscope is useful in classrooms mainly because it
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Q4. When Robert Hooke looked at a thin slice of cork, the small empty compartments he saw reminded him of a
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Q5. When Priya observes a stained onion peel under a school microscope, she will most likely see cells that are
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Q6. In Activity 2.3, Ravi gently scrapes the inside of his cheek, stains the material with methylene blue, and observes it under a microscope. He will most likely see
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Q7. The reason plant cells look firm and are arranged compactly together is mainly because the cell wall
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Q8. Plant cells often have a large empty-looking space called a vacuole. This vacuole mainly helps the cell to
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Q9. A muscle cell in the human body is shaped like a
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Q10. A nerve cell is very long and has branches. The chapter says this elongated and branched shape helps it to
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Q11. The correct sequence of levels of organisation in the body of a living organism is
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Q12. A group of similar cells together forms a
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Q13. A Class 8 teacher asks: 'In which of the following places can microorganisms NOT be found?' The expected answer based on the chapter is
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Q14. Priya's mother prepares batter for idli and dosa at home. The microorganism mainly responsible for fermenting this batter is
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Q15. While doing Activity 2.8, Ravi adds yeast, sugar, and warm water to flour and keeps the dough covered with a damp cloth in a warm place. Warm water and sugar are added because yeast
