Chapter 1: The Ever-Evolving World of Science

Introduction

Science is the study of the natural world through observation, experimentation, and reasoning. It constantly evolves as new discoveries are made. Curiosity drives humans to explore, understand, and innovate.

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1. Importance of Science

• Helps explain natural phenomena.
• Leads to technological advancements.
• Improves daily life through innovations like electricity, medicine, and communication.
• Encourages critical thinking and problem-solving.

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2. Steps in Scientific Study

1. Observation: Notice things carefully.
2. Questioning: Ask “why” and “how”.
3. Hypothesis: Make an educated guess.
4. Experiment: Test the hypothesis.
5. Analysis: Examine the results.
6. Conclusion: Decide whether the hypothesis is correct.

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3. Characteristics of Science

• Evidence-based
• Systematic
• Repeatable experiments
• Open to revision with new discoveries

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4. Branches of Science

1. Physics – Study of matter, energy, and forces
2. Chemistry – Study of substances and their reactions
3. Biology – Study of living organisms
4. Earth Science – Study of the Earth, atmosphere, and space

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5. Applications of Science

• Transportation (cars, trains, airplanes)
• Communication (phones, internet)
• Health (vaccines, medicines, surgeries)
• Agriculture (fertilizers, irrigation, crop rotation)

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6. Key Points to Remember

• Science evolves with time as new discoveries are made.
• Curiosity is the foundation of scientific inquiry.
• Scientific knowledge is tested and evidence-based.
• Everyday life is shaped by scientific innovations.

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Questions – The Ever-Evolving World of Science

1. Very Short Answer (1 mark)

1. What is science?
2. Name one branch of science.
3. Why is curiosity important in science?
4. Give one example of science improving daily life.
5. What is a hypothesis?
6. Name one tool used for observation.
7. Give one example of a scientific experiment.
8. Name one branch of science that studies living organisms.
9. What is the first step in the scientific method?
10. Give one example of a technological advancement due to science.

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2. Multiple Choice Questions (MCQ)

1. Which of the following is a branch of science?
   a) Literature
   b) Biology
   c) Music
   d) History
2. What is the first step in scientific study?
   a) Hypothesis
   b) Experiment
   c) Observation
   d) Conclusion
3. Curiosity in science helps to:
   a) Ignore facts
   b) Ask questions and explore
   c) Memorize information
   d) Avoid experiments
4. Vaccines are an example of:
   a) Physics
   b) Chemistry
   c) Biology
   d) Earth Science
5. Which of these is evidence-based?
   a) Myth
   b) Science
   c) Story
   d) Opinion

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3. Fill in the Blanks

1. Science helps us understand __________.
2. The first step in scientific study is __________.
3. A guess made based on observation is called a __________.
4. Biology is the study of __________.
5. Experiments help to test a __________.

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4. True/False Type

1. Science is based on evidence. (True/False)
2. Curiosity is not necessary for scientific discoveries. (True/False)
3. Physics studies matter and energy. (True/False)
4. Experiments are used to test hypotheses. (True/False)
5. Scientific knowledge never changes. (True/False)

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5. Short Answer Questions (2–3 marks)

1. Define science in your own words.
2. Name three branches of science.
3. Why is observation important in science?
4. Give two examples of science in daily life.
5. What is a hypothesis?

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6. Long Answer Questions (4–5 marks)

1. Explain the steps of scientific study with examples.
2. Describe how curiosity leads to scientific discoveries.
3. Explain the importance of science in daily life and technology.
4. Name and describe the four main branches of science.
5. How does science evolve with time? Give examples.

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7. Higher-Order Thinking (HOT) & Application

1. A student observes that plants grow faster in sunlight than in shade. Suggest steps to test this observation scientifically.
2. How can science help in solving environmental problems like pollution?
3. Give an example where scientific knowledge changed over time.

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8. Passage-Based Questions

Read the passage and answer:
Science is the study of the natural world using observation, experimentation, and reasoning. Curiosity drives scientists to ask questions, form hypotheses, and test them. Scientific knowledge evolves with new discoveries and improves daily life through technology and innovation.

1. Why is curiosity important in science?
2. Name the steps a scientist follows to test a hypothesis.
3. How does science improve daily life?
4. Why does scientific knowledge change over time?

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Answer Key – The Ever-Evolving World of Science

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1. Very Short Answer

1. Study of the natural world using observation, experiments, and reasoning
2. Biology, Physics, Chemistry, Earth Science
3. Curiosity drives exploration and questioning
4. Electricity, medicine, transportation
5. An educated guess based on observation
6. Microscope, magnifying glass, telescope
7. Plant growth experiment, measuring speed of light, etc.
8. Biology
9. Observation
10. Internet, vaccines, airplanes

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2. MCQ Answers

1. b) Biology
2. c) Observation
3. b) Ask questions and explore
4. c) Biology
5. b) Science

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3. Fill in the Blanks

1. natural phenomena
2. observation
3. hypothesis
4. living organisms
5. hypothesis

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4. True/False

1. True
2. False
3. True
4. True
5. False

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5. Short Answer

1. Science is the systematic study of the natural world.
2. Biology, Physics, Chemistry
3. Observation helps gather accurate information to form hypotheses
4. Electricity, medicines, transportation, communication
5. Hypothesis is an educated guess based on observation

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6. Long Answer

1. Steps of scientific study: Observation → Question → Hypothesis → Experiment → Analysis → Conclusion
2. Curiosity makes scientists notice, question, and explore phenomena
3. Science provides tools, medicines, electricity, internet, transportation
4. Physics – matter & energy; Chemistry – substances & reactions; Biology – living organisms; Earth Science – Earth & space
5. Science evolves as experiments, discoveries, and evidence refine understanding; e.g., understanding of planets, medicine

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7. HOT & Application

1. Steps: Observe → Form hypothesis → Experiment (plants in sunlight vs shade) → Record growth → Analyze results → Conclude
2. Science helps develop technology for clean energy, pollution control, waste management
3. Example: Disease treatment improved with vaccines as knowledge increased

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8. Passage-Based

1. Curiosity drives exploration and questioning
2. Observation → Hypothesis → Experiment → Analysis → Conclusion
3. Through technology and discoveries like medicine, electricity, communication
4. Knowledge changes as new evidence and discoveries emerge