Chapter - 1:
Exploring the Investigative World of Science
Easy
Notes:
Introduction to Science Investigation
Science starts with curiosity.
When we ask questions like “Why does a
puri puff up?” or “Why does the Moon
change shape?”, we begin thinking like scientists.
Scientists do not just learn facts — they also try to discover new facts through:
•
 |
Observation
• Experiments
• Careful thinking
What is Investigation in Science?
Investigation means:
• Asking questions
• Testing ideas
• Observing
carefully
• Finding answers
through experiments Example:
Why does dough rise? Why is Earth getting warmer?
Root and Kite Symbol
The textbook uses two symbols:
• Root → Strong knowledge and connection to nature
• Kite → Imagination and curiosity flying high Both are important
in science:
• Stay connected
to real observations
• Think creatively
too!
Class 7 Science Chapter 1: Exploring the Investigative World of Science – Questions & Answers, Summary, Notes PDF
Tiny Organisms and Health
Scientists study microorganisms that are too small to
see.
Some microbes:
• Help us digest
food
• Help make
medicines Others:
• Cause diseases
and infections To stay healthy, we need:
• Nutritious food
• Exercise
• Medicines
• Vaccines
Electricity and Forces Electricity makes our life easier.
Different effects of electric current:
• Heating effect →
Keeps us warm
• Magnetic effect
→ Runs motors and machines Forces help explain:
• Why objects move
• Why balls fall
down
• Why cars stop
with brakes
Pressure, Air, and Weather
Pressure is how force spreads over a surface.
Pressure differences in air can create:
• Gentle breezes
• Strong winds
• Cyclones
Weather events affect:
• Farming
• Daily life
• Human safety
Matter and Particles
Everything around us is made of tiny particles.
In solids:
Particles move very little.
In gases:
Particles move freely.
Materials are classified into:
• Elements
• Compounds
• Mixtures
Example:
Sugar dissolving in tea is called a solution.
Light and Reflection Light helps us see objects.
We learn about:
• Reflection from
mirrors
• Bending of light
through lenses Examples:
• Seeing images in
mirrors
• Corrective
glasses helping people see clearly
Moon and Calendars
The Moon reflects sunlight.
Different Moon phases happen because:
• Earth
• Moon
• Sun
change their positions.
Humans used Moon cycles to make the first calendars.
Class 7 Science Chapter 1: Exploring the Investigative World of Science – Questions & Answers, Summary, Notes PDF
Ecosystems and
Environment All
living things depend on:
• Air
• Water
• Sunlight
• Other living
organisms
These relationships form an ecosystem.
Earth is perfect for life because:
• It has liquid
water
• It has oxygen
• The atmosphere
protects us from harmful rays But human activities can cause:
• Climate change
• Global warming
Science in the Kitchen
– The Puri Experiment Science can be learned anywhere — even in the kitchen!
Questions scientists may ask:
• Why does a puri
puff up?
• Why is one side
thinner?
• Does oil
temperature matter?
Things we can change:
• Dough thickness
• Type of flour
• Oil temperature
Things we can observe:
• Did the puri
puff?
• How long did it
take?
• Did oil
splatter?
Important Rule:
Change only one thing at a time during experiments.
This is called systematic investigation.
Final Message
Science is everywhere
around us.
A curious mind can turn everyday observations into
amazing discoveries.
So keep asking:
•
Why? • How?
•
What happens if…?
That is the true spirit of science!
-------------------------------------------------------------------------------------------
Questions and Answers
Chapter 1:
Exploring the Investigative World of Science
Based on
1. Why does a puri puff up while frying?
Answer:
When a puri is placed in hot oil, the water present inside the dough turns into steam. This steam pushes the two layers of dough apart, causing the puri to puff up like a balloon.
2. Why is one side of a puri thinner than the other?
Answer:
One side becomes thinner because steam pressure inside the puri pushes more strongly on one side during frying. The side that expands more becomes thinner. Oil temperature, dough thickness, and the way the puri is dropped into oil also affect this.
3. What is meant by scientific investigation?
Answer:
Scientific investigation is a systematic method of finding answers to questions through observation, experiments, and careful analysis. Scientists change one factor at a time and observe the results.
4. Why should only one thing be changed during an experiment?
Answer:
Only one factor should be changed at a time so that we can clearly understand its effect on the result. If many things are changed together, it becomes difficult to know which factor caused the change.
5. Why are observations important in science?
Answer:
Observations help scientists collect information and understand what is happening during an experiment. Careful observation leads to better explanations and new discoveries.
6. What are some examples of scientific questions from everyday life?
Answer:
Examples include:
• Why does dough rise?
• Why does a puri puff up?
• Why does the Moon change shape?
• Why is the Earth getting warmer?
7. Why is science called an investigative world?
Answer:
Science is called an investigative world because scientists continuously ask questions, perform experiments, make observations, and improve their understanding about nature and the universe.
8. What is the importance of curiosity in science?
Answer:
Curiosity motivates us to ask questions and explore new ideas. It is the starting point of all scientific discoveries.
9. How are forces useful in daily life?
Answer:
Forces help objects move, stop, speed up, or change direction. They are involved in activities like throwing a ball, applying brakes in a car, and running machines.
10. What causes winds and cyclones?
Answer:
Differences in air pressure cause the movement of air. Small pressure differences create breezes, while large differences can cause storms and cyclones.
11. Why are microorganisms important?
Answer:
Some microorganisms help in digestion, medicine production, and decomposition, while others may cause diseases.
12. Why is Earth suitable for life?
Answer:
Earth is suitable for life because:
• It is at the right distance from the Sun.
• Water remains liquid.
• The atmosphere contains oxygen.
• The atmosphere protects us from harmful ultraviolet rays.
======================================================================================================================================