Which of the following gases is not found free in air?
A.Nitrogen
B.Hydrogen
C.Oxygen
D.Carbon dioxide
Category: Biosphere Mcqs
Nutrients are recycled in the atmosphere with the help of certain micro-organisms referred to:
A.Producers
B.Decomposers
C.Consumers
D.None of these
The most dangerous consequence of excessive deforestation is:
A.Soil erosion
B.Loss of forest wealth
C.Loss of many valuable plants
D.None of these
The study of relation of animals and plants to their surroundings is called:
A.Ecology
B.Ethnology
C.Genealogy
D.Iconology
The fain factor which determines the balance of nature is:
A.Human activities
B.Habit and habitat
C.Environmental pollution
D.Availability of food
Biodegradable wastes can usually be converted into useful substances with the help of:
A.Bacteria
B.Nuclear proteins
C.Radioactive substances
D.None of these
Nitrogen fixation is done by:
A.Red algae
B.Blue green algae
C.Brown algae
D.None of these
Which of the following terms is used for several individuals of a species living together in a locality?
A.Biosphere
B.Bio-community
C.Ecosystem
D.Population
The largest source of pollution in the world is:
A.Industrial effluents
B.Sewage and garbage
C.Automobile exhausts
D.Herbicides and insecticides
Uncontrolled industrialisation leads to acid rain. It is mainly contributed by:
A.Nitrous and sulphur oxide
B.Carbon dioxide
C.Methan gas
D.Chlorofluorocarbons
