In nature, ……….. and ……….. provide enough energy to convert Nitrogen to nitrogen oxides (NO, NO₂, N₂O).

(1) Lightning, Forest fires

(2) Industrial combustions, UV radiation

(3) Forest fire, Lightning

(4) Lightning, UV radiation

(1) Nitrogen Fixation

(2) Ammonification

(3) Nitrification

(4) Denitrification

(1) Formation of Nitrate

(2) Formation of Nitrite

(3) Formation of Ammonia

(4) Formation of Nitrogen

(1) Nitrosomonas

(2) Nitrococcus

(3) Nitrobacter

(4) All of these

(1) Conversion of ammonia to nitrite

(2) Conversion of nitrite to nitrate

(3) Conversion of nitrogen to ammonia

(4) Both B and C

(1) Photoautotroph

(2) Chemoautotroph

(3) Nitrotroph

(4) Organotroph

(1) Leaves

(2) Roots

(3) Soil

(4) Environment

(1) Ammonia

(2) Nitrate

(3) Nitrite

(4) Nitrogen

(1) In leaves

(2) In roots

(3) In soil

(4) In air

(1) Pesudomonas

(2) Thiobacillus

(3) Nitrobacter

(4) Both A and B