๐ Class 7 Science Curiosity – Chapter 1 Notes
๐ The Ever-Evolving World of Science | Amresh Academy
๐งช 1. Properties of Materials
๐ What to Explore:
- ๐ Why are some fruits sour? → Due to acids (เค
เคฎ्เคฒ)
- ๐ก What happens to a turmeric stain? → Shows chemical reaction
⚡ Activities:
- ๐ Use battery + wire + bulb๐ To test conductors (เคाเคฒเค)
๐ง Classification:
- ๐ช Metals: Copper, Iron (shiny, conduct electricity)
- ๐ชต Non-metals: Wood, Plastic (do not conduct)
๐ 2. Changes Around Us
๐ Types of Changes:
✔️ Reversible Changes
๐ Can be reversed
- ❄️ Ice → Water → Ice
❌ Irreversible Changes
๐ Cannot be reversed
- ๐ Fruit ripening
- ๐ Battery used
๐ฅ Role of Heat:
- Heat causes changes ๐ก️
- Example: Ice melts, glaciers melt
๐ง️ Water Cycle:
- ☀️ Evaporation
- ☁️ Condensation
- ๐ง️ Rainfall
๐ Shows how materials change in nature
๐งฌ 3. Life Processes
๐ฆ Changes in Humans:
- Growth, puberty changes ๐
๐พ Animal Life:
- Need food, air, circulation ❤️
- Blood carries nutrients
๐ฟ Plant Life:
- Make food by photosynthesis ๐
- Respire differently than animals
๐ Evolution:
- Living things adapt over time๐ Efficient use of resources
⏰ 4. Time and Measurement
๐ What is Time?
- Measured by clocks ⌚
- Earlier → Sun shadows ๐
๐ฏ Importance:
- Helps manage daily life๐ School, sleep, routines
๐ก 5. Light and Shadows
๐ฆ Importance of Light:
- Helps us see ๐
- Used in discoveries ๐
๐ Shadows:
- Used to tell time
- Shadow puppets ๐ญ
๐ Applications:
- Bulbs for light ๐ก
- Eclipses (shadow of Earth/Moon)
๐ 6. Earth’s Movements
๐ Key Movements:
- ๐ Rotation → Day & Night
- ๐ Moon Revolution → Around Earth
- ☀️ Earth Revolution → Seasons
๐ฑ Effects:
- Daily routine
- Climate changes
๐ Phenomena:
- ๐ Eclipses
- ๐ Day–Night cycle
๐ Final Summary
๐ Science helps us understand:
- Materials ๐งช
- Changes ๐
- Life ๐ฟ
- Time ⏰
- Light ๐ก
- Earth ๐
