The reduction of nitrogen gas to ammonia requires
a) 32 molecules of ATP
b) 18 molecule of ATP
c) 16 molecules of ATP
d) none of these
Rhizobium form symbiotic association with roots of leguminous plants and appear in the form of swelling called
a) bud
b) nodules
c) branch
d) rhizome
The surrounding in which organisms live is
a) environment
b) atmosphere
c) conservation
d) none of these
The thing which man required for survival and comport is called……………
a) effort
b) source
c) environment
d) none
Maintaining the natural resource of the environment and their careful use is
a) environment
b) conservation
c) combustion
d) none of these
The flow of chemical elements and compound between the living organism and the physical environment
b) biogeochemical cycle
a) biological cycle
c) nitrogen cycle
d) none of these
