Study sheet: Introduction to Basic Science

Science Grade 3 Revision Sheet

1. 📌 Essentials

• Science involves asking questions, observing, and experimenting.
• Living things need air, water, food, and shelter.
• Plant parts: roots, stems, leaves, flowers.
• Animal groups: mammals, birds, insects, reptiles.
• Major human organs: heart, lungs, stomach.
• Earth's layers: crust, mantle, core.
• Landforms: mountains, valleys, rivers, plains.
• Weather phenomena: rain, snow, wind, sunshine.
• States of matter: solid, liquid, gas.
• Forces: push, pull, gravity.
• Re and conserve to protect the environment.
• Scientific method: question, hypothesis, experiment, observe, conclude.

2. 🧩 Key Structures & Components

• Living organisms — grow, reproduce, respond to environment.
• Plant parts — roots (absorb water), stems (support), leaves (photosynthesis), flowers (reproduction).
• Animal classifications — mammals (warm-blooded, have hair), birds (feathers, wings), insects (body segments, six legs), reptiles (scaly skin).
• Human organs — heart (pumps blood), lungs (breathe air), stomach (digests food).
• Earth's layers — crust (outer shell), mantle (middle layer), core (center, hot metal).
• Landforms — natural features like mountains, valleys, rivers, lakes.
• Weather elements — rain (water droplets), snow (frozen rain), wind (movement of air), sunshine (solar energy).
• States of matter — solids (definite shape), liquids (flows), gases (expand to fill space).
• Forces — push (force applied away), pull (force drawing toward), gravity (pulls objects toward Earth).

3. 🔬 Functions, Mechanisms & Relationships

• Plants use roots to absorb water and nutrients from soil.
• Leaves perform photosynthesis using sunlight, CO₂, and water.
• Animals are classified based on physical features and behaviors.
• The heart circulates blood, transporting oxygen and nutrients.
• The Earth's crust is broken into landforms shaped by natural forces.
• Weather changes influence climate and environment.
• States of matter change with temperature (e.g., ice melts to water).
• Forces cause movement; gravity pulls objects downward.
• Recycling reduces waste and conserves resources.
• Scientific inquiry follows a sequence: ask, hypothesize, test, observe, conclude.

4. 📊 Comparative Table

Item	Key Features	Notes / Differences
States of Matter	Solid, liquid, gas	Change with temperature
Animal Groups	Mammals, birds, insects, reptiles	Different body coverings and habitats
Earth's Layers	Crust, mantle, core	Composition affects geology
Landforms	Mountains, valleys, rivers, plains	Shaped by natural forces
Forces	Push, pull, gravity	Cause movement and change

5. 🗂️ Hierarchical Diagram

Science Grade 3
 ├─ Scientific Inquiry
 │    ├─ Ask questions
 │    ├─ Observe
 │    └─ Experiment
 ├─ Biology
 │    ├─ Living vs Non-living
 │    ├─ Plant parts
 │    └─ Animal groups
 ├─ Human Body
 │    └─ Major organs and functions
 ├─ Earth Science
 │    ├─ Earth's layers
 │    └─ Landforms & weather
 ├─ Physical Science
 │    ├─ States of matter
 │    └─ Forces
 └─ Environmental Awareness
      └─ Conservation and recycling

6. ⚠️ High-Yield Pitfalls & Confusions

• Confusing plant roots with stems or leaves.
• Mixing up animal classifications (e.g., mammals vs reptiles).
• Assuming all landforms are man-made.
• Believing gases are solids or liquids.
• Overlooking the role of the heart in circulation.
• Confusing weather with climate.
• Thinking all forces are the same; e.g., push vs pull.
• Forgetting to include safety rules in experiments.

7. ✅ Final Exam Checklist

• Define what science is and its purpose.
• List the needs of living things.
• Name and describe plant parts.
• Classify animals into groups.
• Identify major human organs and their functions.
• Describe Earth's layers.
• Recognize different landforms.
• Explain weather phenomena.
• Distinguish between solids, liquids, gases.
• Understand basic forces: push, pull, gravity.
• Know the scientific method steps.
• Use simple tools: magnifying glass, thermometer.
• Record data using charts and graphs.
• Follow safety rules during experiments.
• Recognize the importance of conserving resources.
• Explain how natural resources are protected.
• Understand the role of recycling in environmental care.