🌟 Class 7 Science Curiosity – Chapter 1 Notes
🔍 The Ever-Evolving World of Science | Amresh Academy
🧪 1. Properties of Materials
🔍 What to Explore:
- 🍋 Why are some fruits sour? → Due to acids (अम्ल)
- 🟡 What happens to a turmeric stain? → Shows chemical reaction
⚡ Activities:
- 🔋 Use battery + wire + bulb👉 To test conductors (चालक)
📌 Example Question:
👉 Which materials make a bulb glow? 💡
🧠 Classification:
- 🪙 Metals: Copper, Iron (shiny, conduct electricity)
- 🪵 Non-metals: Wood, Plastic (do not conduct)
🔄 2. Changes Around Us
🔁 Types of Changes:
✔️ Reversible Changes
👉 Can be reversed
- ❄️ Ice → Water → Ice
❌ Irreversible Changes
👉 Cannot be reversed
- 🍎 Fruit ripening
- 🔋 Battery used
🔥 Role of Heat:
- Heat causes changes 🌡️
- Example: Ice melts, glaciers melt
🌧️ Water Cycle:
- ☀️ Evaporation
- ☁️ Condensation
- 🌧️ Rainfall
📌 Shows how materials change in nature
🧬 3. Life Processes
👦 Changes in Humans:
- Growth, puberty changes 📈
🐾 Animal Life:
- Need food, air, circulation ❤️
- Blood carries nutrients
🌿 Plant Life:
- Make food by photosynthesis 🌞
- Respire differently than animals
🌍 Evolution:
- Living things adapt over time👉 Efficient use of resources
⏰ 4. Time and Measurement
🕒 What is Time?
- Measured by clocks ⌚
- Earlier → Sun shadows 🌞
🎯 Importance:
- Helps manage daily life👉 School, sleep, routines
💡 5. Light and Shadows
🔦 Importance of Light:
- Helps us see 👀
- Used in discoveries 🌌
🌑 Shadows:
- Used to tell time
- Shadow puppets 🎭
🌘 Applications:
- Bulbs for light 💡
- Eclipses (shadow of Earth/Moon)
🌍 6. Earth’s Movements
🔄 Key Movements:
- 🌍 Rotation → Day & Night
- 🌙 Moon Revolution → Around Earth
- ☀️ Earth Revolution → Seasons
🌱 Effects:
- Daily routine
- Climate changes
🌑 Phenomena:
- 🌘 Eclipses
- 🌞 Day–Night cycle
📌 Final Summary
👉 Science helps us understand:
- Materials 🧪
- Changes 🔄
- Life 🌿
- Time ⏰
- Light 💡
- Earth 🌍
