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NCERT Solutions and important questions for Class 8 science for CBSE 2020-2021.

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Virat
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Aanandi took two test tubes and marked them A and B. She put two spoonfuls of sugar solution in each of the test tubes. In test tube B, she added a spoonful of yeast. Then she attached two incompletely inflated balloons to the mouth of each test tube. She kept the set-up in a warm place, away from sunlight. (i) What do you predict will happen after 3–4 days? She observed that the balloon attached to test tube B was inflated. What can be a possible explanation for this? (a) Water evaporated in test tube B and filled the balloon with the water vapour. (b) The warm atmosphere expanded the air inside the test tube B, which inflated the balloon. (c) Yeast produced a gas inside the test tube B which inflated the balloon. (d) Sugar reacted with warm air, which produced gas, eventually inflating the balloon. (ii) She took another test tube, 1/4 filled with lime water. She removed the balloon from test tube B in such a manner that the gas inside the balloon did not escape. She attached the balloon to the test tube with lime water and shook it well. What do you think she wants to find out?

Aanandi took two test tubes and marked them A and B. She put two spoonfuls of sugar solution in each of the test tubes. In test tube B, she added a spoonful of yeast. Then she attached two incompletely inflated balloons to the mouth of each test tube. She kept the set-up in a warm place, away from sunlight. (i) What do you predict will happen after 3–4 days? She observed that the balloon attached to test tube B was inflated. What can be a possible explanation for this? (a) Water evaporated in test tube B and filled the balloon with the water vapour. (b) The warm atmosphere expanded the air inside the test tube B, which inflated the balloon. (c) Yeast produced a gas inside the test tube B which inflated the balloon. (d) Sugar reacted with warm air, which produced gas, eventually inflating the balloon. (ii) She took another test tube, 1/4 filled with lime water. She removed the balloon from test tube B in such a manner that the gas inside the balloon did not escape. She attached the balloon to the test tube with lime water and shook it well. What do you think she wants to find out?

(i) After 3–4 days, the balloon on test tube B inflates. Yeast feeds on sugar and produces carbon dioxide gas. This gas collects in the balloon, causing it to expand. That’s why balloon B is inflated. Correct answer: (c) Yeast ...

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Virat
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Various parts of a cell are given below. Write them in the appropriate places in the following diagram. Nucleus, Cytoplasm, Chloroplast, Cell wall, Cell membrane, Nucleoid

In animal cells: nucleus, cytoplasm, cell membrane. In plant cells: all of the above plus cell wall and chloroplasts. In bacterial cells: nucleoid, cell membrane and cytoplasm. Each cell type has unique features. Class 8 Science Grade 8 Chapter 2 The ...

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Virat
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Yes, microbes interact constantly—some help each other grow, while others compete or attack. These interactions affect health, soil fertility and food. Their microscopic relationships are as rich and diverse as those of larger organisms. Class 8 Science Curiosity Chapter 2 The ...

class 8 science chapter 2 the invisible living world: beyond our naked eye question answerthe invisible living world: beyond our naked eye all solutions on – tiwari academyyou thought how these tiny living beings interact with each other
Virat
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Seeing the hidden world would redefine what we consider “living.” Tiny organisms, though small, show complex behaviors. It would teach us that size doesn’t define importance and that life exists even beyond our usual perceptions. Class 8 Science Curiosity Chapter 2 ...

class 8 science curiosity chapter 2 the invisible living world: beyond our naked eye question answerncert solution for class 8 science curiosity chapter 2 the invisible living world: beyond our naked eyeyou think your observation of this hidden world might change
Virat
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If the invisible world became visible, we might see countless tiny organisms everywhere—on skin, in the air and on objects. It would reveal how rich, active and interconnected life is beyond our sight. Class 8 Science Curiosity Chapter 2 The Invisible ...

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