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Virat

Asked: July 31, 2025In: Class 8 Science

Identify the following microorganisms: (i) I live in every kind of environment and inside your gut. (ii) I make bread and cakes soft and fluffy. (iii) I live in the roots of pulse crops and provide nutrients for their growth.

(i) Bacteria live everywhere, including our gut. (ii) Yeast is used in baking to make bread rise. (iii) Rhizobium bacteria live in legume roots and fix nitrogen for plant growth. Class 8 NCERT Science Curiosity Chapter 2 The Invisible Living World: ...

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 ...

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Identify the following microorganisms: (i) I live in every kind of environment and inside your gut. (ii) I make bread and cakes soft and fluffy. (iii) I live in the roots of pulse crops and provide nutrients for their growth.

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

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