The burning of ………..produce carbon dioxide
a) fossils fuels
b) chemicals
c) plants
d) none of these
Nitrogen
is essential for…………………
a) DNA
b) RNA
c) protein
d) all of these
The nitrogen cycle consists of …….main stage.
a) two
b) three
c) four
d) five
Explanation: 1.Nitrogen fixation, 2.Nitrogen uptake, 3.Nitrification and 4.Denitrification
Nitrogen fixation is a process where N2 is converted to……….with help of bacteria
a) nitrates
b) ammonia
c) salt
d) none of these
Nitrogen fixation occur in plants by
a) algae
b) fungi
c) bacteria
d) volvox
Which bacteria convert N2 into ammonia
a) shagella
b) rhizobium
c) protius
d) none of these
