At Bodhiclasses, we believe that true learning extends beyond the pages of a textbook. It arises when students begin to ask new questions, connect diverse ideas, and apply their understanding to real-life contexts. Chapter 1 of the Class 7 Science NCERT textbook, The Ever-Evolving World of Science, invites students to explore science not just as a subject, but as a way of thinking. To deepen that engagement, we have curated a set of 20 extra questions with answers relevant to this chapter.
These questions are designed to reinforce conceptual understanding, encourage critical thinking, and support students in both classroom and exam preparation.
1. Why is science considered a process and not just a collection of facts?
Answer: Science is considered a process because it involves observation, experimentation, asking questions, and forming conclusions. It is an ongoing method of understanding the world rather than just memorizing facts.
2. What role does curiosity play in scientific discovery?
Answer: Curiosity drives individuals to explore the unknown, ask questions, and conduct experiments. Many scientific breakthroughs have originated from a curious observation or an unanswered question.
3. How are everyday changes, like fruit ripening or clothes staining, relevant to science?
Answer: These everyday changes involve chemical or physical reactions, which are key concepts in science. Observing them helps students connect theoretical knowledge to practical life.
4. What is meant by reversible and irreversible changes? Give one example of each.
Answer: Reversible changes can be undone (e.g., melting ice), while irreversible changes cannot be undone (e.g., ripening of a fruit).
5. How can we classify materials based on their ability to conduct electricity?
Answer: Materials that allow electricity to pass through them are called conductors (e.g., copper), while those that do not are called insulators (e.g., rubber).
6. What is the significance of performing experiments in science learning?
Answer: Experiments help verify concepts, develop hands-on skills, and make learning active. They allow students to discover scientific principles through experience.
7. How do natural processes like the water cycle demonstrate the continuity of scientific phenomena?
Answer: The water cycle involves evaporation, condensation, and precipitation — showing how energy and matter are continuously transformed in nature, forming a closed and balanced system.
8. Why is it important to understand the changes occurring in our own body?
Answer: Understanding bodily changes, especially during adolescence, helps us take care of our health and understand basic life processes like growth, digestion, and respiration.
9. How did early humans measure time?
Answer: Early humans measured time using shadows cast by the Sun. Tools like sundials helped them observe the movement of time based on light.
10. What causes day and night on Earth?
Answer: Day and night occur due to the rotation of the Earth on its axis. As the Earth rotates, different parts face the Sun and experience daylight, while others face away and experience night.
11. How do the movements of the Earth and Moon affect natural phenomena?
Answer: The Earth’s rotation and revolution, along with the Moon’s orbit, result in phenomena such as day and night, seasons, and eclipses.
12. What is the educational value of asking questions instead of just answering them?
Answer: Asking questions develops critical thinking, stimulates curiosity, and encourages independent exploration — key traits of scientific thinking.
13. Explain how heat affects the state of matter with examples.
Answer: Heat can cause solids to melt into liquids (ice to water), liquids to vaporize into gases (water to steam), and vice versa through cooling.
14. How are the fields of chemistry, biology, and physics interconnected?
Answer: Scientific disciplines are interconnected. For example, understanding digestion (biology) involves chemical reactions (chemistry) and body heat regulation (physics).
15. Why is it important to learn science through real-life observations?
Answer: Real-life observations make scientific concepts tangible, help in retaining information, and promote practical understanding.
16. What do we learn about environmental responsibility from this chapter?
Answer: The chapter emphasizes that scientific understanding should lead to conscious action. It highlights the need to understand our impact on nature and work towards sustainability.
17. How does studying light and shadow contribute to understanding space and time?
Answer: Observing light and shadow helps in understanding the behavior of celestial bodies, measuring time, and studying events like eclipses.
18. What is the benefit of exploring multiple perspectives in science?
Answer: Exploring different perspectives encourages integrative thinking and innovation, helping students find connections between different scientific ideas.
19. How does scientific thinking help in solving real-world problems?
Answer: Scientific thinking involves observation, analysis, and solution-focused experimentation, which are essential for addressing real-life challenges such as health issues, environmental degradation, and technology development.
20. What message does the title “The Ever-Evolving World of Science” convey?
Answer: The title suggests that science is always growing, adapting, and expanding its boundaries as new questions are asked and new discoveries are made.
