NCERT Class 7 Science Chapter 1 The Ever-Evolving World of Science Solutions to each chapter is provided in the list so that you can easily browse through different chapters NCERT Class 7 Science Chapter 1 The Ever-Evolving World of Science and select need one. NCERT Class 7 Science Chapter 1 The Ever-Evolving World of Science Question Answers Download PDF. NCERT Class 7 Science Solutions.
NCERT Class 7 Science Chapter 1 The Ever-Evolving World of Science
Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. CBSE Class 7 Science Solutions are part of All Subject Solutions. Here we have given NCERT Class 7 Science Solutions and Textbook for All Chapters, You can practice these here.
The Ever-Evolving World of Science
Chapter: 1
1. Why is curiosity considered essential in the study of science?
Ans: Curiosity is essential because science is not just about learning facts but about asking questions, exploring, experimenting, and discovering. A curious mind leads to deeper understanding and encourages new ideas and innovations.
2. What is science mainly about?
Ans: Science is a process of thinking, questioning, and exploring the unknown.
3. What happens to a torch battery after long use?
Ans: The battery runs out and cannot be used again.
4. What is an example of a reversible change.
Ans: Melting of ice into water.
5. What is an example of an irreversible change?
Ans: The ripening of fruits.
6. Do plants also “breathe” and “eat”.
Ans: Yes, plants also need food to grow and they have processes similar to breathing.
7. How did early humans tell time without clocks?
Ans: They observed the shadows of objects in sunlight to tell time.
8. What causes day and night?
Ans: The rotation of the Earth on its axis.
9. What inspired early ideas about flying?
Ans: Simple observations like flying paper planes and birds inspired ideas about flying.
10. Why is curiosity important in science?
Ans: Curiosity leads to new discoveries and deeper understanding.
11. How do plants get their food?
Ans: Plants make their own food through a process called photosynthesis.
12. Write examples of changes in materials, and how are they classified?
Ans: Examples like a torch battery running out, ice melting into water, fruits ripening, and rocks breaking into pebbles.
Changes are classified as reversible or irreversible. For example, melting ice into water is a reversible change because it can freeze back into ice. But ripening of fruits is irreversible because a ripe fruit cannot become unripe again. Some changes happen naturally, and some are affected by heat.
13. Explain the importance of light and shadows?
Ans: Light and shadows are not just for making shadow puppets or telling time. Light helps us see, and studying light has led to a deep understanding of the universe. Light and shadows also cause important phenomena like eclipses. Understanding how the Earth rotates, how the Moon orbits the Earth, and how the Earth orbits the Sun helps us explain day and night and eclipses. Thus, light and shadows play a very important role in science and in our daily lives.
14. Explain how curiosity and simple observations have led to major scientific discoveries. Give examples.
Ans: Curiosity is the heart of science. Simple observations, like watching how a paper plane flies or how birds spread their wings, inspired people to think about flying. These small, curious observations led to big inventions like real airplanes. Similarly, early humans observed shadows to measure time, which helped in the invention of clocks. Thus, simple observations and questions can lead to major scientific achievements.
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