🌟 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
🌍
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