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Virat

Asked: July 31, 2025In: Class 8 Science

Snehal dug two pits, A and B, in her garden. In pit A, she put fruit and vegetable peels and mixed it with dried leaves. In pit B, she dumped the same kind of waste without mixing it with dried leaves. She covered both the pits with soil and observed after 3 weeks. What is she trying to test?

Snehal was testing how composting is affected by mixing dried leaves with kitchen waste. Pit A with leaves would compost faster and smell less due to better air flow and carbon balance compared to Pit B. Class 8 NCERT Science Curiosity ...

Virat

Asked: July 31, 2025In: Class 8 Science

A farmer was planting wheat crops in his field. He added nitrogen-rich fertiliser to the soil to get a good yield of crops. In the neighbouring field, another farmer was growing bean crops, but she preferred not to add nitrogen fertiliser to get healthy crops. Can you think of the reasons?

The bean crop farmer didn’t use nitrogen fertiliser because legumes like beans have root nodules that contain nitrogen-fixing bacteria. These bacteria naturally enrich the soil with nitrogen, reducing the need for additional fertilisers. Class 8 Science Grade 8 Chapter 2 The ...

Virat

Asked: July 31, 2025In: Class 8 Science

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 ...

Virat

Asked: July 31, 2025In: Class 8 Science

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 ...

Virat

Asked: July 31, 2025In: Class 8 Science

Have you thought how these tiny living beings interact with each other?

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 ...

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Virat

Snehal dug two pits, A and B, in her garden. In pit A, she put fruit and vegetable peels and mixed it with dried leaves. In pit B, she dumped the same kind of waste without mixing it with dried leaves. She covered both the pits with soil and observed after 3 weeks. What is she trying to test?

A farmer was planting wheat crops in his field. He added nitrogen-rich fertiliser to the soil to get a good yield of crops. In the neighbouring field, another farmer was growing bean crops, but she preferred not to add nitrogen fertiliser to get healthy crops. Can you think of the reasons?

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

Have you thought how these tiny living beings interact with each other?

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