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Important Questions Chapter 1 Class 7 Science Curiosity NCERT

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The Ever-Evolving World of Science


Short Questions

1.  Why do some fruits taste sour?

Answer: Because they contain acids.

2. What makes a lamp glow?

Answer: Electricity flowing through a bulb.

3.Can ice melting be reversed?

Answer: Yes, by freezing water.

4.How does water from the sea become rain?

Answer: It evaporates and forms clouds.

5. Why do our bodies change in middle school?

Answer: Because of growth and puberty.

6.Do plants breathe like animals?

Answer: Yes, through tiny holes in leaves.

7. How did early humans tell time?

Answer: By observing shadows of objects.

8. What causes day and night?

Answer: Earth rotating on its axis.

9.Why do eclipses happen?

Answer: When Earth or Moon casts a shadow.

10.What is a simple way to explore science?

Answer: Doing experiments and asking questions.


Long Questions

1. How can we classify materials like metals and non-metals?

Answer:We classify them by their properties, like if they conduct electricity. For example, metals shine and conduct heat, but non-metals don’t.

2.Why do some changes, like a battery running out, not reverse?

Answer- Some changes are permanent because the materials inside change completely. Like in a battery, chemicals get used up and can’t be reused.

3.How does heat affect things like ice or glaciers melting?

Answer- Heat makes things warmer, so ice turns to water. In glaciers, heat from the sun causes slow melting over time.

4. How do plants get their food to grow?

Answer- Plants make food using sunlight, water, and air in a process called photosynthesis. They use leaves to capture sunlight and create energy.

5.Why is it important to ask questions in science?

Answer- Asking questions helps us learn how things work and discover new ideas. It makes us curious and helps solve problems in the world.

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