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

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.