Class 7 Science introduces new ideas about nature, life, and everyday science.
The syllabus is wide.
Short notes make revision easier and faster.
These Class 7 Science short notes are simple, clear, and exam-focused.
1. Nutrition in Plants
- Plants make their own food by photosynthesis
- Raw materials: sunlight, carbon dioxide, water
- Chlorophyll helps absorb sunlight
- Modes of nutrition:
- Autotrophic
- Heterotrophic (parasitic, saprotrophic)
Key term: Photosynthesis
2. Nutrition in Animals
- Five steps of nutrition:
- Ingestion
- Digestion
- Absorption
- Assimilation
- Egestion
- Different animals have different digestive systems
- Ruminants chew cud
Key organs: mouth, stomach, small intestine
3. Fibre to Fabric
- Fibres come from plants and animals
- Examples:
- Cotton (plant fibre)
- Wool (animal fibre)
Processes:
- Ginning
- Spinning
- Weaving
- Knitting
4. Heat
- Heat is a form of energy
- Temperature measures hotness or coldness
- Thermometers measure temperature
Modes of heat transfer:
- Conduction
- Convection
- Radiation
5. Acids, Bases, and Salts
- Acids taste sour (lemon, vinegar)
- Bases taste bitter (soap, baking soda)
- Indicators show nature of substances
Examples:
- Litmus
- Turmeric
- China rose
6. Physical and Chemical Changes
- Physical change: no new substance formed
- Chemical change: new substance formed
Examples:
- Melting ice (physical)
- Rusting iron (chemical)
Rusting needs:
- Air
- Moisture
7. Weather, Climate, and Adaptations
- Weather changes daily
- Climate is the average weather over time
Animals adapt to climate:
- Polar bear (cold regions)
- Camel (desert regions)
8. Winds, Storms, and Cyclones
- Wind is moving air
- Warm air is lighter than cold air
- Cyclones are violent storms
Safety measures are important during storms.
9. Soil
- Soil supports plant life
- Soil profile layers:
- Topsoil
- Subsoil
- Bedrock
Types of soil:
- Sandy
- Clayey
- Loamy
10. Respiration in Organisms
- Respiration releases energy
- Types:
- Aerobic
- Anaerobic
Breathing is not the same as respiration.
11. Transportation in Animals and Plants
- Heart pumps blood
- Blood carries oxygen and nutrients
In plants:
- Xylem carries water
- Phloem carries food
12. Reproduction in Plants
- Two types:
- Asexual
- Sexual
Methods of asexual reproduction:
- Budding
- Fragmentation
- Vegetative propagation
13. Motion and Time
- Motion means change in position
- Speed = Distance ÷ Time
Devices to measure time:
- Clock
- Stopwatch
14. Electric Current and Its Effects
- Electric current flows in a closed circuit
- Heating effect produces heat
- Magnetic effect used in electric bells
Conductors allow current to pass.
15. Light
- Light travels in a straight line
- Reflection occurs from mirrors
Types of mirrors:
- Plane
- Concave
- Convex
16. Water: A Precious Resource
- Fresh water is limited
- Conservation of water is important
Ways to save water:
- Rainwater harvesting
- Avoid wastage
17. Forests: Our Lifeline
- Forests support life
- Prevent soil erosion
- Maintain oxygen and carbon dioxide balance
18. Wastewater Story
- Wastewater must be treated
- Sewage treatment plants clean water
Good sanitation prevents diseases.
How to Use These Short Notes
- Read daily for 15–20 minutes
- Revise before exams
- Highlight keywords
- Combine with textbook questions
Final Thoughts
Class 7 Science short notes save time and reduce stress.
They help students revise faster and remember better.