What is the main idea behind "Joint Forest Management Concept" introduced by the Government of India?
The main idea behind joint forest management concept introduced by the Government of India was involving the local communities in the forest conservation.
This concept was adopted considering the extraordinary courage and dedication the local people showed in protecting the wildlife through the movements like Bishnoi's is movement in Jodhpur and Chipko Movement in Garhwal Himalayas.
What do you understand by Snow-blindness?
The inflammation of cornea caused due to the excessive absorption of ultravioet-B radiations is called snow-blindness cataract.
How has DDT caused decline in bird population?
High concentrations of DDT disturb calcium metabolism in birds, which causes thinning of egg shell and their premature breaking, eventually causing decline in bird populations.
Observe the figure A and B given below and answer the following questions
(i) The power generation by the above two methods is non-polluting, True/False.
(ii) List any two applications of solar energy
(iii) What is a photovoltaic cell?
(i) Figure $A$ is solar energy panel and figure $B$ is wind mill device. Both devices produce power without polluting the environment.
(ii) Solar lamp (lantern) (made up of a LED lamp, a photo-voltaic solar panel and rechargeable battery) and solar hot water system (geyser) are the two application of solar energy.
(iii) A solar cell is also called as photovoltaic cell. It is a form of photoelectric cell which converts the light energy into electrical energy by photovoltaic cell.
Write a short note on electronic waste. List the various sources of e-wastes and the problems associated with its disposal.
Solid waste can be biodegradable recyclable non-biodegradable, and can be categoriesed as municipal wastes (se-wage), industrial waste, hospitals and nursing wastes and electronic waste. Irrepairable computers, mobiles and other electronic goods are often known as 'e' waste or electronic waste.
Source of e-waste Majority of the developing countries like China, Pakistan and India import irrepairable electronic goods for their valuable metals like copper, nickel and gold.
Disposal of e-waste Such waste should be burried in landfills or incinerated. In developing countries, metal from e-waste is extracted manually. So, during working with e-waste, one can expose with toxic substances present in it, and may get affected by skin diseases in future. However, recycling is the only solution for the treatment of electronic waste.