World Environment And Ecology MCQ Question and Answer | Geography MCQ Question

Rock dam is a simple approach to prevent the flow of water and prevent undercutting and erosion along the river craned. eg. Manills River has split rock dam in North western slopes region of new South Wales, Australia.

The World's largest bio-fuel plant has been established with a production capacity of 100 million liters per year, is located in Brazil. Brazil is commonly referred to as having the world's first "sustainable biofuels economy," which is a misnomer given that the country has never relied on ethanol to supply more than about 18% of its total energy requirements, though a 50% by volume peak was reached in the mid 1990s. As bio-diversity is pretty high in tropical Brazil, hence the raw material for bio-fuel is easily available.

Earth Summit also known as Rio summit held in Rio-de-Janeiro, Brazil in 1992. About 100 head of states became signatories to Convention on Biological Diversity in this conference.

Shelter belts are arrangement of trees in coastal, dry region to prevent soil erosion. The roots of trees bind the soil and prevent the removal of top layer of soil from action of water or wind.

The energy received by the earth is known as incoming solar radiation which in short is termed as insolation. As the earth is a geoid resembling a sphere, the sun's rays fall obliquely at the top of the atmosphere and the earth intercepts a very small portion of the sun's energy.

Maximum deforestation occurs in tropical zone mostly in Amazon rain forests due to animal (cattle) ranching equalling 14% of world's total annual deforestation. A 1991 study shows 90% of deforested tropical regions becoming farms or ranchland, while only 10% is replanted for future timber harvests.

Aquatic plant Water Hyacinth is effective in preventing the water-pollution caused by industrial waste. Water hyacinth multiplies rapidly in polluted environments & easily scavenges some in organic & organic compounds from water.