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✨ CBSE Class 10 Science – Chapter 13: Our Environment ✨ Ultimate Expert Guide by Grandmaster Bikram Sutradhar 🚀

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✨ CBSE Class 10 Science - Chapter 13: Our Environment ✨ Ultimate Expert Guide by Grandmaster Bikram Sutradhar 🚀

📚 What You’ll Learn in This Guide? ✅ Complete NCERT Solutions with step-by-step explanations ✅ Ecosystem & its Components (Biotic & Abiotic) ✅ Food Chains, Food Webs & Trophic Levels ✅ Energy Flow in an Ecosystem & 10% Law ✅ Biological Magnification & its Impact ✅ Ozone Layer & Its Depletion ✅ Waste Management (Biodegradable & Non-Biodegradable Waste) ✅ Smart Memory Tricks & Shortcuts for Quick Learning

Table of Contents

Environment SirBikramSutradhar bAstronautWay Chapter 13: Our Environment CBSE NCERT Solutions

✨ CBSE Class 10 Science - Chapter 13: Our Environment ✨ Ultimate Expert Guide by Grandmaster Bikram Sutradhar 🚀 — ✨ CBSE Class 10 Science – Chapter 13: Our Environment ✨ Ultimate Expert Guide by Grandmaster Bikram Sutradhar 🚀

🌟 Key Topics Covered in CBSE Class 10 Science – Chapter 13

🌿 Ecosystem & Its Components

Definition: An ecosystem consists of all living organisms interacting with their physical environment.
Biotic Components: Living organisms (Plants, Animals, Microorganisms).
Abiotic Components: Non-living factors (Water, Air, Soil, Sunlight).

🌮 Food Chains, Food Webs & Trophic Levels

Food Chain: A linear sequence of organisms through which nutrients and energy pass.
Trophic Levels:
1. Producers: Plants (Autotrophs) – First Trophic Level
1. Primary Consumers: Herbivores (Deer, Rabbit) – Second Trophic Level
1. Secondary Consumers: Carnivores (Frog, Snake) – Third Trophic Level
1. Tertiary Consumers: Top Carnivores (Lion, Eagle) – Fourth Trophic Level
Food Web: A network of interconnected food chains in an ecosystem.

🔋 Energy Flow in an Ecosystem & 10% Law]

Energy Flow: Sun ➔ Plants ➔ Herbivores ➔ Carnivores ➔ Decomposers
10% Law: Only 10% of energy is transferred from one trophic level to the next; the rest is lost as heat.

🪙 Biological Magnification & Its Impact

Definition: Increase in toxic substances (like pesticides) as they move up the food chain.
Example: DDT absorbed by plants ➔ Insects eat plants ➔ Birds eat insects ➔ Humans eat birds ➔ DDT accumulates in humans.

🌍 Ozone Layer & Its Depletion

Ozone Layer: Protective shield in the stratosphere that absorbs harmful UV rays.
Causes of Depletion:
1. CFCs (Chlorofluorocarbons) from ACs, Refrigerators, Aerosol sprays.
Effects:
1. Skin cancer, Cataracts, Reduced crop yield.
Solutions:
1. Reduce CFCs, Use eco-friendly products, International agreements like the Montreal Protocol.

🛠 Waste Management (Biodegradable & Non-Biodegradable Waste)

Biodegradable Waste: Decomposes naturally (Food, Paper, Cotton, Leaves).
Non-Biodegradable Waste: Does not decompose (Plastic, Glass, Metals).
Problems Caused by Non-Biodegradable Waste:
1. Land & water pollution
1. Kills marine life
1. Blocks drains, causing floods
Solutions:
1. Reduce, Reuse, Recycle (3Rs)
1. Proper disposal of waste

🎯 Important CBSE Board Exam Questions

What are trophic levels?
Differentiate between biodegradable and non-biodegradable waste.
Explain biological magnification with an example.
Mention any two steps taken to reduce it.

🔧 Smart Study Tips & Tricks ✨ Mnemonic for Trophic Levels: PPST (Producers → Primary → Secondary → Tertiary) ✨ 3Rs of Waste Management: Reduce, Reuse, Recycle ✨ 10% Law

🚀 Why This Guide is a Must-Have for CBSE Class 10 Students? ✅ Expertly Curated Content – By Grandmaster Bikram Sutradhar 🚀

💪 Ace Your CBSE Class 10 Science Exam with This Ultimate Guide! 🏆 💡 Start Learning Today & Score High Marks! 🌟