Topics
Crop Production and Management
- Crop and Its Types
- Soil Formation and Preparation for Agriculture
- Agricultural Implements
- Manuring (Biomanuring)
- Fertilizers
- Methods to Replenish Nutrients in Your Soil
- Improved methods of agriculture
- Food Security
- Weeding
- Harvesting of Crops
- Storage of Food Grains
- Animal Products used as Food
Microorganisms: Friend and Foe
Synthetic Fibres and Plastics
- Fibre
- Fabrics
- Man-made Fibre: Synthetic Fibres
- Rayon
- Nylon
- Dacron, Terylene, Terene
- Man-made Fibre: Plastics
- Biodegradable Plastics
- Harmful Effects of Plastics
- Recycling of Plastic
Coal and Petroleum
- Energy Resources > Conventional energy resources or non-renewable energy resources
- Carbon: A Versatile Element
- Special Features of Carbon
- Non-crystalline/Amorphous Forms: Coal
- Extraction of Coal
- Non-crystalline/Amorphous Forms: Coke
- Petroleum
- Refining of Crude Petroleum
- Conventional Sources of Energy > Natural Gas
- Some Natural Resources Are Limited
Materials: Metals and Non-metals
Combustion and Flame
- Chemical Properties of Carbon Compounds > Combustion
- Precautions and Safety Measures
- Types of Combustion
- Flame
- Fuel
- Types of Fuel
- Fuel Efficiency
Conservation of Plants and Animals
- Deforestation and Its Causes
- Consequences of Deforestation
- Conservation of Forests
- Conservation of Wildlife
- Endemic Species
- Migration
- Recycling of Paper
- Reforestation
Reproduction in Animal
- Fertilization in Human
- Embryo Formation in Viviparous and Oviparous Animals - Young Ones to Adults
Reaching the Age of Adolescence
- Secondary Sex Characteristics
- Role of Hormones in Initiating Reproductive Function
- Reproductive Phase of Life in Humans
- Hormones Other than Sex Hormones
- Role of Hormones in Completing the Life History of Insects and Frogs
- Nutritional Needs of Adolescents
- Personal Hygiene for Adolescence
Cell - Structure and Functions
Force and Pressure
- Force
- Force - Push or Pull
- Forces Are Due to an Interaction
- Exploring Forces
- A Force Can Change the State of Motion
- Force Can Change the Shape of an Object
- Effect of Force
- Types of Forces>Contact and Non-Contact Forces
- Thrust and Pressure
- Pressure of liquid
- Factors Affecting Liquid Pressure
- Atmospheric Pressure
Friction
- Force of Friction
- Factors Affecting Friction
- Friction - A Necessary Evil
- Effects of Friction
- Increasing and Reducing Friction
- Fluid Friction
Sound
Chemical Effects of Electric Current
- Conductor of Electricity: Liquid
- Electricity
- Chemical Effects of Electric Current
- Electrical Conduction in Solids
Some Natural Phenomena
- Lightning and Lightning Safety
- Force of Friction
- Electric Charge
- Types of Charges and Their Interaction
- Transfer of Charges
- Electroscope
- Lightning and Lightning Safety
- Earthquake
- Protection Against Earthquakes
Light
- Climatic Factors > Light
- Reflection of Light
- Terms Used in Reflection of Light
- Law of Reflection of Light
- Types of Reflection
- Multiple Reflections
- Prism
- Dispersion of Light
- The Human Eye
- Care of the Eyes
- Visual Impairment and Braille System
Star and Solar System
Pollution of Air and Water
- Pollution
- Case Study: The Taj Mahal
- Green House Effect
- Preventive Measures of Green House Effect
- Preventive Measures of Global Warming
- Case Study: Ganga Pollution and Ganga Action Plan
- Potable Water
- Purification of Water
Notes
POLLUTION OF THE GANGA:-

Awareness about the problems caused by unthinkingly exploiting our resources has been a fairly recent phenomenon in our society. And once this awareness rises, some action is usually taken.
The Ganga Action Plan:- This multi-crore project came about in 1985 because the quality of the water in the Ganga was very poor. Coliform is a group of bacteria, found in human intestines, whose presence in water indicates contamination by disease-causing microorganisms.
As you can see, there are some measurable factors which are used to quantify pollution or the quality of the water that we use for various activities. Some of the pollutants are harmful even when present in very small quantities and we require sophisticated equipment to measure them.
The pH of water is something that can easily be checked using universal indicator.
THE FIVE R’s:-
Refuse: This means to say No to things people offer you that you don’t need. Refuse to buy products that can harm you and the environment, say No to single-use plastic carry bags. Reduce: This means that you use less. You save electricity by switching off unnecessary lights and fans. You save water by repairing leaky taps. Do not waste food.
Reuse: This is actually even better than recycling because the process of recycling uses some energy. In the ‘reuse’ strategy, you simply use things again and again. Instead of throwing away used envelopes, you can reverse it and use it again. The plastic bottles in which you buy various food-items like jam or pickle can be used for storing things in the kitchen.
Reduce: This means that you use less. You save electricity by switching off unnecessary lights and fans. You save water by repairing leaky taps. Do not waste food.
Repurpose: This means when a product can no more be used for the original purpose, think carefully and use it for some other useful purpose. For example, cracked crockery, or cups with broken handles can be used to grow small plants and as feeding vessels for birds.
Recycle: This means that you collect plastic, paper, glass and metal items and recycle these materials to make required things instead of synthesising or extracting fresh plastic, paper, glass or metal. In order to recycle, we first need to segregate our wastes so that the material that can be recycled is not dumped along with other wastes.
