151.

Biomagnification refers to

• rapid growth due to excessive intake of nutrients

• increase in population size

• decrease in population size

• increase in concentration of non-degrabable pollutants as they pass through food chain

CO is more toxic than CO₂ because

• it affects the nervous system

• it damages lungs

• it reduces the oxygen carrying capacity of haemoglobin

• it forms acid with water

Acid rain are produced by:

• excess NO₂ and SO₂ from burning fossil fuels

• excess production of NH₃ by industry and coal gas

• excess release of carbon monoxide by incomplete combustion

• excess formation of CO₂ by coinbustion and animal respiration

Which of the following is formed by the reactions of UV-rays of sunlight?

• SO₂

• CO

• Ozone

• Florides

Which of the following is not a pollutant?

• Hydrogen

• Carbon dioxide

• Sulphur dioxide

• Carbon monooxide

Main air pollutant is :

• CO

• CO₂

• S

• N₂

Green muffler is used against which type of pollution ?

• Air

• Soil

• Water

• Noise

The sphere of living matter together with water, air and soil on the surface of earth is called

• atmosphere

• hydrosphere

• lithosphere

• biosphere

The ozone hole over Antarctica develops each year between

• Late December and early February

• Late February and early April

• Late April and early June

• Late August and early October

• Late August and early October

Which of the following statements does not apply to eutrophication?

• It is the natural ageing of a lake by nutrient enrichment of its water

• In a young lake the water is cold and clear and supports less life

• The nutrients such as sulphur and phosphorus encourage the growth of aquatic organisms in the lake

• Pollutants released by man radically accelerate the ageing process of a lake

• Pollutants released by man radically accelerate the ageing process of a lake