Вопрос № 1056170 - Экология

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Since the demise of the Soviet Union, grain harvest fell drastically. Severe drought in 1998–1999 led to a harvest of 48 million tons and 60.2 million tons respectively, adding more to the economic crisis that hit Russia in 1998, and thus forcing Russia to accept humanitarian aid. In 2006, Russia harvested 78.4 million tons of grain. In 2007, Russia harvested 81.5 million tons. 2007 crops production exceeded the level of 1990 by 10 %, while livestock output was lagging behind the 1990 level by about 30 %.

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Large cities with thousands of smoky industrial enterprises pollute the air we breathe and the water we drink. Every year world industry pollutes the atmosphere with about 1,000 million tons of dust and other harmful substances. Many cities suffer from smog. Beautiful old forests disappear forever. Their disappearance upsets the oxygen balance. As a result some rare species of animals, birds, fish and plants disappear forever, a number of lakes and rivers dry up.

In the picture you can see a young dying heron in the contaminated-oil bushwoods after oil dumping in the Barataria Bay on 23 May, 2010. The following factors cause massive bird kill in the ocean after oil dumping.

In accordance with the Law of Tolerance the organism's success is limited by ______as well as ______ of the environmental impact.

Match sewage purification plant and sewage purification method

1. aerotank


2. mud trap

3. reactor-ozonator plant

Rural population  tend cattle and small ruminants  close to zinc-lead enterprise. In the grazing land there is high concentration of lead (Pb). In ground waters (mine wells) the average concentration of lead reaches 0,6 mg/l. The concentration of lead (Pb) content in meat is 2 mg/kg,  in milk it is 0,3 mg/l, in bread – 0,6 mg/kg, in potatoes – 1 mg/kg. Person’s daily requirement for products is as follows: drinking water – 2 l, meat – 0,1 kg, milk – 0,8 l, bread – 0,1 kg, potatoes – 0,3 kg. Admissible  daily lead (Pb) intake  recommended by World Health Organization equals 0,43 mg. Actual lead (Pb) daily intake coming with water and food is ______ mg. (Give your answer as a whole number.)