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Vacuoles store water, nutrients and waste. In plant cells, a large central vacuole maintains pressure, provides structural support and helps keep the cell firm, aiding the plant in standing upright. Class 8 Science Curiosity Textbook Chapter 2 The Invisible Living World ...

role of vacuoles in plant cellsthe invisible living world: beyond our naked eye question answer chapter 2the invisible living world: beyond our naked eye question answer class 8 pdf download
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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 ...

the invisible living world: beyond our naked eye question answer chapter 2the invisible living world: beyond our naked eye question answer class 8 pdf downloadtwo spoonfuls of sugar solution in each of the test tubesyeast produced a gas inside the test tube b which inflated the balloon
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Both onion and cheek cells have cell membranes, cytoplasm and a nucleus. Onion cells have a cell wall and are rectangular, while cheek cells lack a cell wall and appear rounded or irregular. Class 8 NCERT Science Curiosity Chapter 2 The ...

differences did you observe between the cells of onion peelhuman cheek cellsthe invisible living world: beyond our naked eye question answer chapter 2the invisible living world: beyond our naked eye question answer class 8 pdf download
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Water, due to its curved shape in the flask, bends light rays inward. This creates a magnified image of the object below, just like a convex lens does in a magnifying glass. class 8 science chapter 2 the invisible living world ...

the invisible living world: beyond our naked eye question answer chapter 2the invisible living world: beyond our naked eye question answer class 8 pdf downloadwater inside a flask behave like a magnifying glass