The sphere of living matter together with water, air and soil on the surface of earth is called
atmosphere
hydrosphere
lithosphere
biosphere
D.
biosphere
Biosphere is the biologically inhabited part of earth along with its abiotic or physiochemical components. It consists of three sub- divisions, namely, atmosphere, lithosphere and hydrosphere.
(i) Atmosphere refers to the transparent gaseous mantle surrounding the earth.
(ii) Lithosphere refers to the outer solid crust of earth.
(iii) Hydrosphere is liquid mantle of earth.
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
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
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
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 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
