Students rely on Class 7 Science Extra Questions and Class 7th Curiosity Chapter 1 The Ever Evolving World of Science Important Extra Question Answer to improve their grades.
Class 7 Science Chapter 1 The Ever Evolving World of Science Extra Questions
Class 7 Science Chapter 1 Extra Questions on The Ever Evolving World of Science
The Ever Evolving World of Science Class 7 Very Short Question Answer
Question 1.
What is science?
Answer:
Science is the study of the world around us through observation and experiments.
Question 2.
What do scientists do to understand how things work?
Answer:
Scientists observe things, ask questions, and perform experiments.
Question 3.
Give one example of a reversible change.
Answer:
Melting of ice is a reversible change.
Question 4.
Give one example of an irreversible change.
Answer:
Ripening of fruit is an irreversible change.
Question 5.
What is an experiment?
Answer:
An experiment is a test done to learn more or prove an idea.
Question 6.
How is a shadow formed?
Answer:
A shadow is formed when something blocks light.
Question 7.
What does the term curiosity refer to?
Answer:
Curiosity refers to the desire to learn or know more.
Question 8.
What is meant by a chemical change?
Answer:
A chemical change is a change where a new substance is formed, like turmeric staining clothes.
Question 9.
What is meant by a physical change?
Answer:
A physical change is a change in size, shape, or state without forming a new substance.
Question 10.
What is meant by the term “growth”?
Answer:
Growth is the process of becoming bigger or more developed.
Question 11.
How does science help us in everyday life?
Answer:
Science helps us understand the world, solve problems, and improve technology.
Question 12.
What is innovation? Give one example.
Answer:
Innovation means creating new ideas or ways to do things. Example: Airplanes invented by studying birds.
Question 13.
Name any two branches of science.
Answer:
Biology and Physics.
Question 14.
What do you understand by biology?
Answer:
Biology is the study of living things like plants and animals.
Question 15.
What is earth science?
Answer:
Earth science is the study of the Earth, including land, water, and weather.
The Ever Evolving World of Science Class 7 Short Question Answer
Question 1.
During winter, your mirror becomes foggy after a hot shower. What scientific concept can you relate this to?
Answer:
This is an example of condensation. Water vapour in the warm air condenses on the cold mirror surface.
Question 2.
If you wanted to invent something new, like a flying machine, what might you observe in nature to help you? Give an example.
Answer:
I could observe birds, insects, or even flying squirrels. For example, the invention of the airplane was inspired by birds and how their wings work.
The Ever Evolving World of Science Class 7 Long Question Answer
Question 1.
Explain the role of observation and experiments in science.
Answer:
Observation and experiments are essential in science. Scientists use their senses to observe things around them and ask questions about how and why things happen. Experiments are performed to test ideas, find answers, and discover new knowledge. These steps help scientists understand natural phenomena and improve our lives through innovation and discoveries.
Question 2.
Describe the difference between reversible and irreversible changes with examples.
Answer:
Reversible changes are those that can be undone or reversed, such as melting of ice or folding a piece of paper. These changes do not result in the formation of a new substance. On the other hand, irreversible changes cannot be undone and often result in a new substance. For example, burning of paper and cooking of food are irreversible changes because the original material cannot be restored.
Question 3.
What are the major branches of science? Explain any two of them.
Answer:
The major branches of science are Biology, Physics, Chemistry, and Earth Science.
(i) Biology is the study of living things like plants, animals, and humAnswer:It helps us understand how life works, grows, and inter¬acts.
(it) Earth Science deals with the Earth, including land, water, air, and weather. It helps us learn about natural disasters, climate, and natural resources.
Question 4.
How has science improved our lives with the help of innovations? Give examples.
Answer:
Science has greatly improved our lives through innovations. By observing nature, scientists have created machines and tools to make life easier. For example, the invention of airplanes was inspired by birds flying. Medical discoveries have helped cure diseases. Technological advances like mobile phones and the internet have changed the way we live and communicate.
Question 5.
What is a chemical change? How is it different from a physical change? Give examples of each.
Answer:
A chemical change results in the formation of a new substance, and it cannot be reversed easily. An example is iron rusting or turmeric staining clothes. A physical change, however, affects the form of a substance without creating a new one, such as melting butter or tearing paper. Physical changes are usually reversible, while chemical changes are not.
Question 6.
Why is curiosity important in science? How does it help scientists?
Answer:
Curiosity drives scientists to explore and learn more about the world around them. It leads them to ask questions, seek answers, and make discoveries. Without curiosity, many scientific breakthroughs and inventions would not have happened. It helps scientists stay motivated and open-minded, always looking for better solutions and understanding.
The Ever Evolving World of Science Extra Questions for Practice
Question 1.
Sakshi sees water droplets on the outside of her cold water bottle. What kind of change is this? Explain why it happens.
Question 2.
A friend of yours accidentally spilled turmeric (haldi) on your white shirt, and it leaves a yellow stain that doesn’t go away easily. What type of change has happened? Why can’t it be reversed?
Question 3.
You left an iron nail outside, and after a few days, it turned reddish-brown. What type of change is this? What caused it?
Question 4.
Siya made a paper boat. Later, she unfolded it to use the paper again. What kind of change is this? Explain.
Question 5.
Your grandfather tells you they used shadows to tell time in the past. How do you think that worked? Can we still use this method today?