Soil erosion can be prevented by
restricted human activity
good plant cover
checking movement of animals
wind screen alone
Minerals and metals are
biodegradable resources
renewable
non-renewable
inexhaustable
_____________ are those resources whose quantity is known.
Potential resources
Actual resources
Natural resources
Economic resources
Soil is composed of
Mineral +Water + Air
Mineral + Organic Matter + Air
Mineral + Organic matter+ Air + Water
Organic Matter + Water
Organic matter decayed to a relatively stable amorphous state formed when soil micro organism decompose animal and plant material into elemant usable by plants.
Manure
Peat
Humas
Green manure
The species, which are in danger of extinction are referred as -------
endangered species
vulnerable species
threatened species
rare species
How many types of natural resources are there?
three
two
four
five
The bulk fixation of carbon through photosynthesis take place in ------
crop plants
oceans
tropical rain forests
both tropical rain forests and crop plants
Main renewable source of energy is
Forest
Fuel gas
Cattle-dung
Coal
Who will maintain the organic matter of the soil?
Fungi and Semi Parasites
Cyanobacteria and Parasitic animals
Protozoans and slime moulds
Bacteria and Fungi
