What are the key aspects of environmental conservation, biogas production, and its advantages?

Here are the answers to your questions:

1. a) Planting more trees (afforestation). b) Protecting natural habitats and ecosystems.

2. The use of energy-saving stoves reduces the amount of fuel (like wood or charcoal) needed, which helps to decrease deforestation and lower greenhouse gas emissions.

3. The gas fuel obtained by fermenting organic matter in an airtight container is called biogas.

4. The organisms that help in the fermentation of organic matter in a biogas digester are called anaerobic bacteria or methanogens.

5. Three materials that can be used to make biogas are:

   • Animal manure (e.g., cow dung)
   • Crop residues (e.g., straw, leaves)
   • Food waste

6. Two advantages of using biogas over conventional fuels (like kerosene or firewood) are:

   • It is a renewable energy source, as it is produced from organic waste.
   • It helps in waste management by converting organic waste into useful fuel and fertilizer.