Science - Know about it

 

What is Science ?

Science is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe. It involves the observation, identification, description, experimental investigation, and theoretical explanation of natural phenomena. Science relies on empirical evidence and the scientific method, which includes observation, hypothesis formulation, experimentation, and the validation or refutation of hypotheses.

In Easy language, Science is the study of how things work in the world around us. It involves asking questions, making observations, doing experiments, and finding out how things happen. Scientists use these methods to understand everything from the tiniest particles to the largest galaxies. 

Key Points (SCIENCE DISCOVERY PROCESS) :

1. Observation: Watching and noticing things in the world.

2. Question: Asking why or how something happens. 

3. Hypothesis: Make a possible explanation.

          4.  Experiment: Testing ideas to see if they are correct.

5. Evidence/Data: Gathering information to support or refute an idea.

          6. Conclusion: Decide what the results show.

EXAMPLE

Observation:

A plant near sunlight grows faster.

Question:

Does sunlight help plants grow?

Hypothesis:

Plants grow better when they receive sunlight.

Experiment:

Keep two similar plants in different light conditions.

Result:

Compare their growth.

Conclusion:

Use the evidence to decide whether the hypothesis is supported.

Science helps us understand how and why things happen.

For example:

🤔 Why does rain fall?

🤔 Why do plants grow?

🤔 Why do objects fall down?

🤔 How does electricity work?

🤔 How does our body function?

Scientists try to answer these questions by studying evidence. 

🌟 SCIENCE IS EVERYWHERE!

🏠 At Home

🍳 Cooking → Chemistry

💡 Switching on a bulb → Physics

🌱 Growing plants → Biology

🧊 Ice melting → Matter and heat

🌍 In Nature

🌧️ Rain → Earth Science

⚡ Lightning → Physics

🌳 Trees → Biology

🌋 Volcanoes → Geology

🚀 In Technology

📱 Mobile phones → Physics + Technology

💻 Computers → Computer Science

🚗 Cars → Physics + Engineering

🚀 Rockets → Space Science

🎯 WHY DO WE STUDY SCIENCE?

Science helps us:

✅ Understand nature

✅ Solve problems

✅ Create new technology

✅ Improve health

✅ Protect the environment

✅ Explore space

✅ Make life easier

Main Areas of Science:

1. Natural Science: Studies nature and includes:

          a)  Physics: How things move and interact (like gravity or light).

 Definition :- The study of matter, energy, and the fundamental forces of nature. Topics include mechanics, thermodynamics, electromagnetism, and quantum mechanics.

   b) Chemistry: What things are made of and how they change (like reactions).

Definition :-The study of substances, their properties, reactions, and the changes they undergo. It includes areas like organic chemistry, inorganic chemistry, physical chemistry, and biochemistry.

   c) Biology: The study of living things (like plants and animals).

Definition :-The study of living organisms and their interactions with the environment. Subfields include botany, zoology, genetics, microbiology, and ecology.

              d) Earth Science: The study of earth.

Definition :-The study of the Earth and its processes. It includes geology, meteorology, oceanography, and environmental science.

 e) Astronomy: The study of universe.

Definition :-The study of celestial objects, space, and the universe as a whole.

2. Social Science: Studies people and societies, including:

   - Psychology: How people think and behave.

Definition :-The study of the mind and behavior, including cognitive, emotional, and social processes.

   - Sociology: How societies work and interact.

Definition :-The study of society, social institutions, and social relationships.

   - Economics: How countries' GDP will grow.

Definition :-The study of the production, distribution, and consumption of goods and services

 - Political Science: To understand the political structure and                   functionality of a particular country and how it is impacting its own         country.

Definition :-The study of politics, government systems, and political behavior.

- Anthropology: To understand the culture and its development in a particular country.

Definition :-The study of human societies, cultures, and their development.

3. Formal Science: Studies ideas and theories using logic and math, including:

   - Mathematics: Numbers and shapes.

Definition :-The abstract study of numbers, quantity, structure, space, and change. It includes areas such as algebra, calculus, geometry, and statistics.

   - Computer Science: How computers solve problems.

Definition :-The study of algorithms, data structures, software design, and the theoretical foundations of computation.

4. Applied Science: Uses science to solve practical problems, including:

   - Engineering: Designing and building things like bridges or computers.

Definition :-The application of scientific principles to design and build machines, structures, and other items. Branches include civil, mechanical, electrical, and chemical engineering.

   - Medicine: Keeping people healthy and treating illnesses.

Definition :-The science and practice of diagnosing, treating, and preventing disease. Subfields include surgery, pediatrics, psychiatry, and oncology.

- Environmental Science: protect ecosystems and human health.

Definition :-The study of environmental processes and how they can be managed to protect ecosystems and human health.

- Agricultural Science: Improving cultivation, production of crops.

Definition :-The study of producing crops and raising livestock, including the development of new agricultural techniques and technologies.

The science and practice of diagnosing, treating, and preventing disease. Subfields include surgery, pediatrics, psychiatry, and oncology.

MATTER

What Is Matter?

Anything that has mass and occupies space is called matter.

Examples:

💧 Water

🪨 Stone

🌳 Wood

💨 Air

📚 Book

STATES OF MATTER

Matter commonly exists in three main states.

🧊 SOLID

Properties:

✅ Fixed shape

✅ Fixed volume

Examples:

🧱 Brick

🪨 Rock

🧊 Ice

Particle Diagram:

●●●●

●●●●

●●●●

Particles are closely packed.

LIQUID

Properties:

❌ No fixed shape

✅ Fixed volume

Examples:

💧 Water

🥛 Milk

🛢️ Oil

Particle Diagram:

● ●● ●

** ● ●●**

● ● ●

Particles can move around each other.

GAS

Properties:

❌ No fixed shape

❌ No fixed volume

Examples:

💨 Oxygen

💨 Carbon dioxide

💨 Water vapour

Particle Diagram:

● ●

** ●**

** ● ●**

Particles are far apart and move freely.

COMPARISON OF STATES OF MATTER

Property	Solid	Liquid	Gas
Fixed Shape	Yes	No	No
Fixed Volume	Yes	Yes	No
Particle Movement	Very little	Moderate	Very fast
Compressible	Very little	Very little	Yes

⚛️ ATOMS – BUILDING BLOCKS OF MATTER

Everything around us is made of tiny particles.

These particles are called:

⚛️ ATOMS

Atoms contain smaller particles.

➕ PROTON

Charge: Positive (+)

⚪ NEUTRON

Charge: Neutral (0)

➖ ELECTRON

Charge: Negative (−)

SIMPLE ATOM DIAGRAM

          e⁻

 

      ┌─────────┐

      │ NUCLEUS │

      │ p⁺  n⁰  │

      └─────────┘

 

   e⁻             e⁻

Remember:

Nucleus = Protons + Neutrons

Electrons move around the nucleus.

ELEMENTS AND COMPOUNDS

ELEMENT

An element contains only one type of atom.

Examples:

🟡 Gold

⚙️ Iron

💨 Oxygen

⚫ Carbon

COMPOUND

A compound is formed when different elements chemically combine.

Example:

Hydrogen + Oxygen

⬇️

💧 WATER

Formula:

H₂O

Another Example:

Sodium + Chlorine

⬇️

🧂 Sodium Chloride

PHYSICAL AND CHEMICAL CHANGES

PHYSICAL CHANGE :- No new substance is formed.

Examples:

🧊 Ice → Water

✂️ Cutting paper

💧 Water → Ice

CHEMICAL CHANGE :- A new substance is formed.

Examples:

🔥 Burning wood

🧲 Rusting iron

🍳 Cooking food

QUICK COMPARISON

Physical Change	Chemical Change
Usually changes form	Creates new substances
Often reversible	Often difficult to reverse
Example: melting ice	Example: burning wood

FORCE

Definition :- Force is a push or pull.

Examples:

🚪 Pushing a door

🪑 Pulling a chair

⚽ Kicking a football

🏋️ Lifting weights

FORCE CAN:

➡️ Start motion

➡️ Stop motion

➡️ Change direction

➡️ Change speed

➡️ Change shape

MOTION

Motion means: A change in the position of an object over time.

Examples:

🚗 Moving car

✈️ Flying airplane

🏃 Running person

⚽ Rolling ball

TYPES OF FORCE

🌍 GRAVITY

Gravity pulls objects toward Earth.

🍎 Apple falls down.

⚽ Ball returns to Earth.

👨 Humans remain on the ground.

🧲 MAGNETIC FORCE

Magnets attract certain materials.

Example:

🧲 + Iron = Attraction

✋ FRICTION

Friction happens when surfaces rub against each other.

Friction helps us:

👟 Walk

🚗 Stop vehicles

✍️ Write

⚡ ENERGY

Definition :- Energy is the ability to do work.

We need energy for almost everything.

🌈 TYPES OF ENERGY

             ☀️ Solar Energy :- Energy from the Sun.

             ⚡ Electrical Energy :- Energy used by electrical devices.

            🔥 Heat Energy :- Energy that produces warmth.

           🎵 Sound Energy :- Energy related to sound and vibrations.

           🍎 Chemical Energy :- Energy stored in food and fuels.

            🌬️ Wind Energy :- Energy from moving air.

🔄 ENERGY TRANSFORMATION

Energy can change from one form to another.

     Example:

                                 ☀️ Sunlight

                                          ⬇️

                                🔋 Solar Panel

                                          ⬇️

                                ⚡ Electricity

                                          ⬇️

                                💡 Light

💡 LIGHT :- Light helps us see.

Sources of Light

☀️ Sun

💡 Bulb

🔥 Fire

🕯️ Candle

🔄 REFLECTION

Reflection happens when light bounces back.

Example:

🪞 Mirror

You see your image because light reflects from the mirror.

↪️ REFRACTION

Refraction happens when light changes direction while passing from one medium to another.

Example:

🥤 A straw in water may appear bent.

---

🔊 SOUND

Sound is produced by:

🔄 VIBRATIONS

Examples:

🥁 Drum vibrating

🎸 Guitar strings vibrating

🔔 Bell vibrating

Sound can travel through:

✅ Solids

✅ Liquids

✅ Gases

Sound cannot travel through a complete vacuum.

---

⚡ ELECTRICITY

Electricity is extremely important in modern life.

We use electricity for:

💡 Lights

📱 Phones

💻 Computers

🏥 Hospitals

🏭 Factories

---

SIMPLE ELECTRIC CIRCUIT

 🔋 Battery

    │

    │

   🔘 Switch

    │

    │

   💡 Bulb

    │

    └───────────────

When the circuit is complete, electric current can flow.

---

🧲 MAGNETISM

Magnets have two poles.

🧲 NORTH POLE

🧲 SOUTH POLE

---

IMPORTANT RULE

Like poles:

N + N ❌ Repel

S + S ❌ Repel

Unlike poles:

N + S ✅ Attract

---

🧬 BIOLOGY – SCIENCE OF LIFE

Biology is the study of living organisms.

Living things include:

🌳 Plants

🐕 Animals

👨 Humans

🦠 Microorganisms

---

🔬 THE CELL

The cell is the basic structural and functional unit of life.

All living organisms are made of cells.

---

DIFFERENT TYPES OF CELLS

💪 Muscle cells → Help movement

🧠 Nerve cells → Carry messages

🩸 Blood cells → Transport substances

🌱 PLANTS AND PHOTOSYNTHESIS

Plants make their own food through:

🌿 PHOTOSYNTHESIS

Plants need:

☀️ Sunlight

💧 Water

💨 Carbon dioxide

🌿 Chlorophyll

PHOTOSYNTHESIS INFOGRAPHIC

       ☀️ SUNLIGHT

            ↓

💨 CARBON DIOXIDE → 🌿 PLANT ← 💧 WATER

                         ↓

                   🍬 FOOD

                         +

                       💨 OXYGEN

Plants release oxygen that is important for many living organisms.

❤️ THE HUMAN BODY

The human body contains many organs.

🧠 BRAIN

Controls and coordinates many body activities.

❤️ HEART

Pumps blood.

🫁 LUNGS

Help us exchange gases during breathing.

🍽️ STOMACH

Helps digest food.

🫁 RESPIRATORY SYSTEM

The respiratory system helps us breathe.

Breathing In:

💨 Oxygen enters the body.

Breathing Out:

💨 Carbon dioxide leaves the body.

❤️ CIRCULATORY SYSTEM

The heart pumps blood through the body.

Blood helps transport important materials.

        ❤️ HEART

                   ↓

      🩸 BLOOD

                   ↓

    BODY CELLS

                   ↓

      ❤️ HEART

🦠 MICROORGANISMS

Microorganisms are tiny living organisms.

They are usually seen using a:

🔬 MICROSCOPE

Examples:

🦠 Bacteria

🍄 Some fungi

🧫 Protozoa

MICROORGANISMS CAN BE:

Helpful

🥛 Making yogurt

🍞 Making bread

♻️ Decomposition

Harmful

Some microorganisms can cause diseases.

🌍 EARTH – OUR HOME

Earth provides:

💨 Air

💧 Water

🌳 Natural resources

🏞️ Land

Earth supports life.

💧 THE WATER CYCLE

Water continuously moves around Earth.

💧 WATER CYCLE PROCESS

        ☀️ SUN

                 ↓

     EVAPORATION

                 ↓

       ☁️ CLOUDS

                ↓

    CONDENSATION

               ↓

       🌧️ RAIN

              ↓

      COLLECTION

             ↓

        🌊 WATER

             ↓

       REPEAT 🔄

🌦️ WEATHER

Weather is the condition of the atmosphere over a short period.

Examples:

☀️ Sunny

🌧️ Rainy

🌬️ Windy

❄️ Cold

🌍 CLIMATE

 Climate describes the usual weather pattern of a place over a long period.

🚀 THE SOLAR SYSTEM

The Solar System includes the Sun and objects moving under its gravitational influence.

PLANETS

1️⃣ Mercury

2️⃣ Venus

3️⃣ Earth

4️⃣ Mars

5️⃣ Jupiter

6️⃣ Saturn

7️⃣ Uranus

8️⃣ Neptune

🪐 EASY ORDER REMEMBERING SENTENCE FOR PLANETS

My Very Educated Mother Just Served Us Noodles.

M → Mercury

V → Venus

E → Earth

M → Mars

J → Jupiter

S → Saturn

U → Uranus

N → Neptune

🌌 THE UNIVERSE

The Universe contains:

⭐ Stars

🪐 Planets

🌌 Galaxies

☄️ Other space objects

☀️ THE SUN

The Sun is:

⭐ A STAR

It provides light and energy that support life on Earth.

🌌 THE MILKY WAY

Earth is part of the:

🌌 MILKY WAY GALAXY

♻️ ENVIRONMENT

The environment includes:

🌳 Plants

🐘 Animals

💧 Water

💨 Air

🏔️ Land

All living organisms depend on the environment.

🚨 POLLUTION

Pollution damages the environment.

💨 AIR POLLUTION

Sources:

🚗 Vehicles

🏭 Factories

🔥 Burning fuels

💧 WATER POLLUTION

Sources:

🗑️ Waste

🧪 Chemicals

♻️ Plastic

🌍 LAND POLLUTION

Sources:

🗑️ Garbage

🧴 Plastic

☣️ Harmful chemicals

♻️ THE 3Rs

REDUCE

Use fewer unnecessary resources.

REUSE

Use things again.

RECYCLE

Convert waste into useful products.

🤖 SCIENCE AND TECHNOLOGY

Science helps us understand.

Technology helps us apply scientific knowledge.

Examples

🔬 Science → Understanding electricity

💡 Technology → Electric lights

🧬 Science → Understanding biology

💊 Technology → Medicines

🚀 Science → Understanding space

🛰️ Technology → Satellites

🤖 ARTIFICIAL INTELLIGENCE

Artificial Intelligence, or AI, is an important modern technology.

AI can help with:

🧠 Information processing

🔍 Pattern recognition

💻 Automation

🗣️ Language-related tasks

🔬 Scientific research

🧠 HOW TO LEARN SCIENCE EASILY

⭐ TIP 1: ASK QUESTIONS

Always ask:

❓ Why?

❓ How?

❓ What happens if...?

⭐ TIP 2: UNDERSTAND, DON'T ONLY MEMORIZE

Instead of memorizing a sentence, understand the reason behind it.

⭐ TIP 3: CONNECT WITH REAL LIFE

🍳 Cooking = Chemistry

⚽ Sports = Physics

🌳 Plants = Biology

🌧️ Rain = Earth Science

⭐ TIP 4: DRAW DIAGRAMS

Diagrams help you understand:

❤️ Human body

🌿 Photosynthesis

⚡ Circuits

🌍 Water cycle

🪐 Solar System

⭐ TIP 5: PRACTICE QUESTIONS

Science becomes easier with practice.

🌟 IMPORTANT SCIENCE FACTS

🌍 Earth moves around the Sun.

☀️ The Sun is a star.

🧬 Living things are made of cells.

💧 Water exists as solid, liquid, and gas.

🌱 Plants make food through photosynthesis.

⚡ Electricity powers modern technology.

🧲 Magnets create magnetic forces.

🌌 Earth is part of the Milky Way Galaxy.

📖 KEY VOCABULARY

Word	Easy Meaning
Science	Study of the natural world
Observation	Carefully noticing
Experiment	Scientific test
Hypothesis	Possible explanation
Matter	Anything with mass and space
Atom	Building block of matter
Force	Push or pull
Energy	Ability to do work
Cell	Basic unit of life
Gravity	Force pulling objects toward Earth
Photosynthesis	Plants making food
Pollution	Harmful damage to the environment
Ecosystem	Living things and their surroundings

---

📝 MULTIPLE CHOICE QUESTIONS

1. Science is mainly based on:

A. Guessing

B. Observation and evidence

C. Magic

D. Luck

Answer: B

---

2. Which branch studies living organisms?

A. Physics

B. Chemistry

C. Biology

D. Astronomy

Answer: C

---

3. Anything with mass and occupying space is called:

A. Energy

B. Matter

C. Force

D. Light

Answer: B

---

4. What is the basic unit of life?

A. Atom

B. Cell

C. Organ

D. Tissue

Answer: B

---

5. Which force pulls objects toward Earth?

A. Magnetic force

B. Friction

C. Gravity

D. Electricity

Answer: C

---

6. Which process helps plants make food?

A. Respiration

B. Digestion

C. Photosynthesis

D. Circulation

Answer: C

---

7. Which is a renewable energy source?

A. Coal

B. Petroleum

C. Solar energy

D. Diesel

Answer: C

---

8. The Sun is a:

A. Planet

B. Star

C. Galaxy

D. Satellite

Answer: B

---

9. Sound is produced by:

A. Darkness

B. Vibrations

C. Gravity

D. Magnets

Answer: B

---

10. Which is NOT one of the 3Rs?

A. Reduce

B. Reuse

C. Recycle

D. Remove

Answer: D

---

✍️ SHORT ANSWER QUESTIONS

1. Define science.
2. Name the three major branches of science.
3. What is matter?
4. What is an atom?
5. Define force.
6. What is energy?
7. Explain photosynthesis.
8. What is gravity?
9. What is pollution?
10. What is the water cycle?

---

🧠 THINKING QUESTIONS

1. What would happen if Earth suddenly had no gravity?

Think about:

• Humans
• Buildings
• Water
• The atmosphere

---

2. What would happen if plants disappeared from Earth?

Think about:

• Oxygen
• Food
• Animals
• Humans

---

3. How would life change without electricity?

Think about:

💡 Lighting

📱 Communication

🏥 Hospitals

💻 Technology

---

🏆 FINAL SCIENCE QUIZ

Level 1: Easy ⭐

1. What is a push or pull called?

A. Energy

B. Force

C. Matter

D. Light

---

2. Which organ pumps blood?

A. Brain

B. Lung

C. Heart

D. Stomach

---

3. Which planet do we live on?

A. Mars

B. Venus

C. Earth

D. Jupiter

---

Level 2: Medium ⭐⭐

4. What is the process by which plants make food?

A. Respiration

B. Photosynthesis

C. Digestion

D. Circulation

---

5. Which particles have a negative charge?

A. Protons

B. Neutrons

C. Electrons

D. Nucleus

---

6. Which state of matter has no fixed shape or volume?

A. Solid

B. Liquid

C. Gas

D. Ice

---

Level 3: Challenge ⭐⭐⭐

7. Why is experimentation important in science?

---

8. Explain the difference between weather and climate.

---

9. Give one example of energy transformation.

---

10. Explain why friction is useful in daily life.

---

✅ ANSWER KEY

Level 1

1. B – Force
2. C – Heart
3. C – Earth

Level 2

4. B – Photosynthesis
5. C – Electrons
6. C – Gas

Level 3 – Sample Answers

7. Experimentation helps scientists test ideas and collect evidence.

8. Weather describes short-term atmospheric conditions, while climate describes usual weather patterns over a long period.

9. A solar panel changes sunlight into electrical energy.

10. Friction helps us walk, hold objects, write, and stop vehicles.

---

🎓 FINAL REVISION MAP

                         🔬 SCIENCE

                             │

        ┌────────────────────┼────────────────────┐

        │                    │                    │

     ⚛️ PHYSICS          🧪 CHEMISTRY         🧬 BIOLOGY

        │                    │                    │

 Force & Motion          Matter & Atoms       Living Things

 Energy                  Elements              Cells

 Light                   Compounds             Plants

 Sound                   Reactions             Human Body

 Electricity

        │

        └─────────────── 🌍 EARTH & SPACE

                          │

                  Weather • Environment

                  Water Cycle • Solar System

                  Universe • Pollution