INDIAN GEOGRAPHY

Detailed explanation-1: -Energy resources that have been used for a very long time are called Conventional Energy Resources. For example, firewood, and fossil fuels like coal, petroleum, natural gas etc.

Detailed explanation-2: -Firewood is a conventional source which is non-renewable.

Detailed explanation-3: -Firewood is an example of a conventional source of energy. It comes under a non-commercial group of conventional energy. Conventional sources of energy are available in limited quantity apart from hydro-electric power.

Detailed explanation-4: -Conventional sources of energy are the ones that are commonly used, and generally non-renewable sources of energy, which are being used since a long time. Examples of conventional sources of energy include oil, natural gas, coal, biomass, and electricity.

Detailed explanation-5: -Solution : (i) Wood has calorific value as compared to other sources of fuel. <br> (ii) It causes air pollution on burning. <br> (iii) Cutting down of trees causes depletion of forest leading to imbalance in nature. <br> (iv) Only 8-10% energy of burning firewood utilised and the remaining is wasted.