Nitrogen-based chemical fertilizers are used in agriculture and gardening to grow fruits and vegetab...: ответ на тест 1056169 - Экология

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.)

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What is it also important to have for dinner?
There is no doubt that dinner is the biggest meal of the day. It consists of several courses. For the first course you may have some soup – noodle, mushroom or cabbage soup, or may be some fish soup for a change. For the main course you may have meat, chicken or fish dishes, for example steak or fried fish with spaghetti or potatoes (boiled or fried). It is also important to have vegetables – green peas, carrots, tomatoes, cucumbers. For dessert you may have some fruit, fruit juice, or just a cup of tea with a slice of cake. In many houses the midday meal is the chief one of the day, and in the evening people have much simplier supper – sausages, beefsteak, eggs, or just bread and cheese, a cup of cocoa or stewed fruit, and nuts.

1 hectare of forest annually produces as much as 28 tons of oxygen. 12 million hectares are annually clear cut. Thus our Planet annually receives  ____ mln. tons of oxygen less than it’s due. (Give your answer as a whole number.)  

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