Question

(a) How does construction of dams across the river get linked with production of greenhouse gases?
(b) How do technological inputs improve the efficiency of bio-mass fuels?

Answer 1

Answer:

(a) The vegetation gets submerged under the waters, in a dam. It rots under anaerobic conditions and produces methane, which is a greenhouse gas.

(b) Technological inputs to improve the efficiency of bio mass fuels are:-

(i) Burning wood in a limited supply of oxygen. The water and volatile materials present in the wood get removed and charcoal is left behind.

Charcoal burns flames and is relatively smokeless and with higher heating efficiency.

(ii) Similarly, cow dung, various plant materials like residue after harvesting the crops, vegetable waste and sewage are decomposed in the absence of oxygen to give bio gas

Answer 2

Dams and bio-mass fuels

Explanation:

Dams and greenhouse gas:

1. The vegetation gets submerged under the waters, in a dam. It rots under anaerobic conditions and produces methane, which is a greenhouse gas.

Technological inputs to improve the efficiency of bio-mass fuels:

1. Wood is burnt in limited supply of oxygen to produce charcoal. Charcoal is used as fuel as can burn with high heating capacity and is relatively smokeless.
2. Animal and plant waste materials are decomposed in the absence of oxygen to produce biogas. This biogas is stored and transferred through pipes for use.