Short and simple food chains are rare in the world and may be found in simple ecosystems like:
A.Savanna
B.Tundra
C.Grassland
D.Desert
Category: MISCELLANEOUS Mcqs
The annual population growth rate of some countries like Great Britain, Sweden, Norway, Hungary and Japan is:
A.Zero%
B.Nearly zero%
C.0.50%
D.1%
Of the total body weight of the organism, water constitutes about:
A.50% to 80%
B.40% to 60%
C.70 to 90%
D.80% to 90%
The back and forth movements of chemical elements, between organisms and environment along characteristic circular paths and known as:
A.Biochemical cycles
B.Ecological cycles
C.Chemical cycles
D.None of these
The bacteria, which reduce nitrates in the soil to gaseous nitrogen, are known as denitrifying bacteria such as:
A.Nitromonas
B.Pseudomonas
C.Nostoc
D.Rhizobium
The precious skins of beavers, muskrats, seals, minks and foxes etc, are used as luxury furs and in:
A.Textile industry
B.Leather industry
C.Chemical industry
D.Soap industry
Symbiotic association in which both the partners get benefit and neither cansurvive without the other is called:
A.Mutualism
B.Commensalism
C.Parasitism
D.None of these
Non-renewable environmental resources include various metals non-metalic minerals and
A.Coal
B.Natural gas
C.Oil
D.Fossil fuels
Certain cities of Pakistan have been subjected to tremendous air pollution due to increased:
A.Urbanization
B.Mechanization
C.Industrialization
D.Civilization
The earth’s atmosphere contains over _____ % by volume of nitrogen gas:
A.58
B.68
C.78
D.None of these
