CBSE Important Questions Class 6 Science Chapter 1 – The Wonderful World of Science

Class 6 Science Chapter 1 The Wonderful World of Science is the first chapter of the new NCERT textbook Curiosity. It introduces students to what science is and how scientists work. Students learn that science is a step-by-step study of the natural world, and they meet the steps of the scientific method: observation, asking a question, making a hypothesis (an educated guess), doing an experiment, analysing the results and drawing a conclusion.

These CBSE important questions for Class 6 Science Chapter 1 cover matching the steps of the scientific method with their meanings, putting the steps in the correct order, using the method to solve everyday problems such as a plant with yellow leaves, why experiments matter, and why scientists work in large teams. Every question has a clear step-by-step answer in simple English, so students can practise on their own, parents can check the working, and teachers can use them for class tests. A free printable PDF of these important questions is also available on this page.

Q1. Which of the following options correctly matches the terms involved in the scientific method with their appropriate meaning?

(a) 1-C; 2-B; 3-A; 4-D
(b) 1-B; 2-D; 3-C; 4-A
(c) 1-B; 2-D; 3-A; 4-C
(d) 1-D; 2-A; 3-B; 4-C

Answer: (c) 1-B; 2-D; 3-A; 4-C
Observation (1) means carefully watching or noticing something interesting, so it matches B. For example, you notice that plants in the sunny part of your garden are taller.
Hypothesis (2) is an educated guess about a possible answer, so it matches D. Here your guess could be that plants grow taller because they get more sunlight.
Analysis (3) means examining the results to see if they support your guess, so it matches A.
Experimentation (4) means conducting tests to check the hypothesis, so it matches C. You would grow one plant in the sun and one in the shade, keeping water and soil the same.

Q2. Imagine you observed that a plant grows faster in sunlight than in shade. You decide to use the scientific method to investigate why this happens. The table below lists the steps of the scientific method in random order, with details from your investigation.

Which of the following sequences correctly orders the steps of the scientific method for your investigation?
(a) 4 → 3 → 2 → 1 → 5
(b) 3 → 4 → 2 → 1 → 5
(c) 1 → 2 → 3 → 4 → 5
(d) 4 → 2 → 3 → 1 → 5

Answer: (a) 4 → 3 → 2 → 1 → 5
First you observe (step 4) that the plant in sunlight grows faster.
Then you make a hypothesis (step 3), an educated guess that sunlight is the reason.
Next you do an experiment (step 2) by growing one plant in the sun and one in the shade.
After that you analyse (step 1) the growth of both plants.
Finally you draw a conclusion (step 5) that sunlight helps the plant grow faster.
Option (b) is wrong because the guess cannot come before the observation. Option (c) starts with analysis, which is not possible before an experiment. Option (d) puts the experiment before the hypothesis.

Q3. How does the scientific method help in solving everyday problems?

Answer: The scientific method helps solve everyday problems by giving us a step-by-step way to find solutions.
It begins with observation, where we notice the problem. Then we ask a question about it. Next we form a hypothesis, which is a possible explanation. After that we conduct an experiment to test the hypothesis and we analyse the results. Finally we draw a conclusion, which either confirms or rejects the hypothesis.
This way, our solutions are based on evidence and logical reasoning instead of guesswork.

Q4. Summarise the importance of conducting experiments in the scientific method. How do experiments contribute to validating a hypothesis?

Answer: Experiments are important in the scientific method because they give us a proper way to test a hypothesis.
By conducting experiments we collect data and watch what happens under controlled conditions, where only one thing is changed at a time.
This data shows us whether our hypothesis is supported or not. If the results match the hypothesis, the hypothesis becomes stronger and more believable. If the results do not match, the hypothesis is either changed or rejected.
So experiments make sure that scientific conclusions are based on evidence and not just on assumptions.

Q5. Imagine a group of students examining the temperature data from an experiment where they measured how fast water heats up under different conditions (for example, with or without a lid on the pot).
a. What part of the scientific method are the students using when examining the temperature data?
b. What might their hypothesis have been before the experiment?
c. How could the students use the conclusion from their experiment to improve future tests or everyday tasks?

Answer: a. The students are in the Analysis step. They are examining the data to find patterns and to see how the different conditions affected the heating of the water.
b. Their hypothesis could have been: "Water will heat up faster with a lid on the pot than without a lid."
c. The students could conclude that using a lid keeps the heat inside the pot. They can use this in everyday cooking to heat water faster and save fuel, and they can plan better tests in future by controlling other things such as the amount of water and the flame size.

Q6. Define science in your own words. How does it help us understand the world around us?

Answer: Science is the systematic study of the natural world through observation, experimentation and analysis. Systematic means it follows proper steps instead of guessing.
Science helps us understand the world in three main ways:
• It uncovers how things work, from tiny cells inside our body to the planets in space.
• It explains natural happenings, such as why it rains or why the sky looks blue.
• It gives solutions to everyday problems, such as medicines for diseases and machines that make our work easier.
Through science we gain knowledge that improves our lives and helps us make better, informed decisions.

Q7. Describe how each step of the scientific method can be applied to investigate and solve the problem of a plant's leaves turning yellow.

Answer: Observation: You notice that the leaves of the plant are turning yellow. This tells you that something is wrong.
Question: You ask, "Why are the leaves turning yellow?" This question guides your whole investigation.
Hypothesis: You make an educated guess, for example that the plant is not getting enough water or enough sunlight.
Experiment: You test your guess by watering the plant more often, or by moving it to a sunnier place. Change only one thing at a time.
Analysis: You watch the plant after the change and see whether the leaves become green again.
Conclusion: You decide whether your hypothesis was correct. If the leaves turn green after more water, your guess was right. If nothing changes, you try a different hypothesis, such as poor soil.

Q8. While drinking cold water, you observe droplets forming on the outer surface of the glass. You had not poured water outside. Which step of the scientific method comes after this observation?
(a) Forgetting the event
(b) Guessing a possible explanation
(c) Reporting it to the class teacher
(d) Measuring the temperature of the glass

Answer: (b) Guessing a possible explanation
After you observe something, the next step in the scientific method is to form a hypothesis, which is a possible explanation for what you saw. Here you might guess that the water droplets came from the air around the cold glass. This guess can then be tested.

Q9. Scientific studies are often a collaborative effort rather than the work of a single individual. Explain why conducting scientific studies in large teams is a common and beneficial practice.

Answer: Working in large teams is useful because scientific problems are often complex and need many different skills that one person may not have.
• Different kinds of experts: A team can have biologists, engineers, people who handle numbers and many others, so the work is studied from every side.
• Checking each other's work: Team members review one another's work, which helps catch mistakes and makes the results more accurate and reliable.
• Faster work and new ideas: Tasks get finished more quickly, and sharing ideas within the team often leads to new discoveries.

Q10. Why is the process of scientific discovery often compared to a big adventure? Explain your reasoning.

Answer: Science is compared to a big adventure because it is a never-ending journey of exploring and discovering.
Just like an adventurer, a scientist steps into the unknown, asks questions, faces difficulties and keeps going because of curiosity. Along the way there are failures and surprises, and at the end there is the thrill of finding something new. This excitement of exploring the unknown makes science feel like an adventure.

Q11. How are scientific studies conducted?
(a) Alone
(b) In large teams
(c) By memorizing facts
(d) Without asking questions

Answer: (b) In large teams
Most scientific studies today are carried out by large teams of scientists working together, because big problems need many different skills and many pairs of hands.

Q12. What is one of the most fascinating aspects of science?
(a) It is limited to laboratories.
(b) It only involves studying large objects.
(c) It is like a giant and unending jigsaw puzzle.
(d) It has a fixed amount of knowledge to discover.

Answer: (c) It is like a giant and unending jigsaw puzzle.
Science never finishes. Every new discovery adds one more piece to a huge puzzle, and each piece opens up more questions. This endless search for knowledge, driven by curiosity and tested by observation, experiment and analysis, is one of the most fascinating things about science.

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