CBSE Class 6 Science Chapter 1: The Wonderful World of Science — Case Study Questions
The following 5 Case Study Questions are based on Chapter 1: The Wonderful World of Science from the NCERT Class 6 Science textbook Curiosity. Read each passage carefully and answer the questions that follow.
Case Study Questions
Riya is a Class 6 student who loves asking questions. One morning, she noticed that the sky was blue and wondered why. Instead of simply accepting this, she asked her science teacher about it. Her teacher encouraged her to first observe carefully, write down what she noticed, and then try to find an explanation. Riya spent the next few days reading books, watching videos, and even performed a simple experiment with a glass of water and a torch to understand how light scatters. She finally understood that sunlight contains many colours and the atmosphere scatters blue light the most. Her teacher praised her for thinking like a true scientist.
Riya demonstrates scientific curiosity — the most important quality of a scientist. Instead of accepting things without questioning, she wondered "why" and sought an explanation. The NCERT Curiosity textbook is named after this very quality, as curiosity is the starting point of all scientific inquiry.
Riya followed these steps of the scientific method:
- Observation — She noticed the sky was blue
- Question — She asked "why is the sky blue?"
- Investigation — She read books and watched videos
- Experiment — She performed an experiment with water and a torch
- Conclusion — She understood how light scatters in the atmosphere
This case study tells us that science is not limited to laboratories. Riya conducted her investigation at home using simple materials (water and a torch). Science can happen anywhere — at home, in the garden, in the kitchen, or outdoors. Scientific thinking is a way of life, not just a school subject.
Arjun wanted to find out whether plants grow faster with or without sunlight. He took two identical pots with the same soil and planted the same type of seeds in each. He placed one pot near a sunny window and kept the other in a dark cupboard. He watered both plants equally every day. After two weeks, the plant near the window had grown tall and healthy with green leaves, while the plant in the dark had grown thin, pale, and weak. Arjun recorded his observations every day in a notebook. He repeated the same experiment two more times to make sure his results were correct. Each time, he got the same result.
Arjun used identical pots, soil, and seeds to ensure a fair test. In a scientific experiment, only one variable (sunlight) should be changed at a time while all other conditions remain the same. This way, any difference in growth can be correctly attributed to the presence or absence of sunlight, not to other factors.
Arjun repeated the experiment to confirm that his results were reliable and consistent, not due to chance or error. This tells us that good scientific practice requires:
- Repeating experiments multiple times
- Getting consistent results before drawing conclusions
- Not trusting results from a single experiment alone
Consistent results across multiple trials give confidence that the findings are scientifically valid.
Arjun's conclusion was that plants need sunlight to grow properly. The plant near the sunny window grew tall and healthy with green leaves, while the plant kept in darkness grew weak, pale, and thin. This demonstrates the importance of sunlight for plant growth and food-making (photosynthesis).
Priya noticed that all the plants on her window sill were bending towards the window where sunlight came in. She found this interesting and told her friend Meera about it. Meera said it was just a coincidence, but Priya disagreed. Priya said, "Let me prove it." She carefully turned all the plants around so they faced away from the window. After three days, she observed that the plants had bent back again towards the window. She wrote down her observations carefully. Priya then asked her teacher what this bending was called, and the teacher explained it was called phototropism — the tendency of plants to grow towards light.
Priya followed the Observation step — the first and most important step of the scientific method. She carefully noticed something unusual (plants bending towards the window) and paid attention to it instead of ignoring it.
Priya proved it was not a coincidence by performing a simple experiment:
- She turned all the plants away from the window
- She waited and observed for three days
- She found that the plants bent back towards the window again
- She recorded her observations carefully
This showed that plants consistently grow towards light — it was not random or accidental. This is scientific thinking — not accepting things without evidence.
Priya's approach shows that a scientific thinker does not accept observations as mere coincidences. Instead of agreeing with Meera, Priya chose to investigate and find evidence. An ordinary observer might have ignored it, but Priya used the scientific method — observe, question, experiment, and conclude. This is the difference between passive observation and active scientific inquiry.
In 1796, Edward Jenner, a British doctor, noticed that milkmaids who caught cowpox (a mild disease) never seemed to get smallpox (a deadly disease). He observed this pattern carefully and formed a hypothesis — that infection with cowpox protected people from smallpox. He tested this by injecting a young boy with cowpox, and later exposed him to smallpox. The boy did not get smallpox. This discovery led to the development of the first vaccine. Today, because of vaccines developed using scientific knowledge, diseases like smallpox have been completely eliminated from the world. This is a perfect example of how science (understanding disease) and technology (making vaccines) work together to benefit humanity.
Observation: Milkmaids who caught cowpox never seemed to get smallpox.
Hypothesis: Infection with cowpox protects people from getting smallpox.
This is a classic example of scientific observation leading to a hypothesis that was later tested and proved correct, ultimately saving millions of lives through vaccination.
This case study shows science and technology working together:
- Science — Jenner used the scientific method (observation, hypothesis, experiment) to understand how the body's immune system works against diseases
- Technology — This scientific knowledge was applied to develop vaccines — a practical tool that prevents disease
Science provides the knowledge and understanding. Technology applies that knowledge to create solutions that benefit humanity. Together, they have helped eliminate deadly diseases from the world.
Positive impact: Development of vaccines and medicines that have saved millions of lives and eliminated deadly diseases like smallpox.
Negative impact: Scientific knowledge has also been used to create weapons of mass destruction and industrial processes that cause pollution and environmental damage.
Science is a powerful tool — its impact depends on how humans choose to use it.
India has a rich and ancient tradition of scientific thinking. Over 1500 years ago, Aryabhata calculated the approximate value of pi (π) and explained that the Earth rotates on its own axis. Much later, in the 20th century, C.V. Raman discovered the Raman Effect — a discovery about how light behaves when it passes through substances — and won the Nobel Prize in Physics in 1930, becoming the first Asian to do so. Dr. A.P.J. Abdul Kalam, known as the Missile Man of India, led the development of India's first satellite launch vehicle and ballistic missiles. He later became the President of India. These great scientists inspire students across the country to pursue science with dedication and curiosity.
Aryabhata's two major contributions were:
- He calculated the approximate value of pi (π ≈ 3.14) — a fundamental mathematical constant
- He explained that the Earth rotates on its own axis — a revolutionary astronomical concept that was far ahead of his time
These contributions were made over 1500 years ago, showing India's ancient tradition of scientific inquiry.
C.V. Raman's Nobel Prize in Physics (1930) is historically significant because:
- He was the first Asian scientist to win a Nobel Prize in science
- He won it for discovering the Raman Effect — how light scatters when passing through substances
- It proved that Indian scientists could make world-class contributions to science
- It inspired generations of Indian students to pursue scientific research
Class 6 students can learn these important lessons:
- Curiosity leads to great discoveries — All three scientists were driven by curiosity and a desire to understand the world
- Science has no boundaries of time or place — From ancient India (Aryabhata) to modern India (Kalam), scientific thinking has always flourished here
- Dedication and hard work pay off — C.V. Raman's Nobel Prize and Kalam's achievements came through years of dedicated work
- Science can be a service to the nation — Dr. Kalam's work strengthened India's defence and space capabilities
These scientists show that great achievements in science are possible for anyone with curiosity, dedication, and a scientific mindset.