Class 8 Science

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Category: Class 8 Science

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

Virat

Asked: July 31, 2025In: Class 8 Science

Take 2 slices of bread. Place one slice in a plate near the sink. Place the other slice in the refrigerator. Compare after three days. Note your observations. Give reasons for your observations.

The bread near the sink shows mold growth due to warmth and moisture. The refrigerated bread remains unchanged because cold slows microbial activity. This proves microorganisms need warmth and moisture to grow effectively. class 8 science chapter 2 the invisible living ...

Virat

Asked: July 31, 2025In: Class 8 Science

Devise an experiment to test that microorganisms need optimal temperature, air and moisture for their growth.

Place moist bread slices in three conditions: warm air, cold fridge and sealed airtight. After three days, compare mold growth. Mold grows best in warmth with air and moisture, proving microbes need these conditions. Class 8 NCERT Science Curiosity Chapter 2 ...

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 ...

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Category: Class 8 Science

Take 2 slices of bread. Place one slice in a plate near the sink. Place the other slice in the refrigerator. Compare after three days. Note your observations. Give reasons for your observations.

Devise an experiment to test that microorganisms need optimal temperature, air and moisture for their growth.

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?

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