Question : (a) The equations given below represent the different stages of Nitrogen Cycle in plants. (i) 2NH_(3)^(+)+3O_(2)overset([A])rarr 2NO_(2)^(-)+2H^(+)+2H_(2)O (ii) 2NO_(2)^(-)+O_(2)overset([B])rarr 2NO_(3)^(-) (iii) underset("[Nitrate]")(NO_(3)^(-))overset([C])rarr underset("[Molecular Nitrogen]")(N_(2)) In the above equations [A], [B],[C] indicate the bacteria which is responsible for the reaction. Name them. (b) Define Denitrification. (c) Which enzyme is required for Nitrogen fixation ?

Question : (a) The equations given below represent the different stage

1.	Question : (a) The equations given below represent the different stages of Nitrogen Cycle in plants. (i) 2NH_(3)^(+)+3O_(2)overset([A])rarr 2NO_(2)^(-)+2H^(+)+2H_(2)O (ii) 2NO_(2)^(-)+O_(2)overset([B])rarr 2NO_(3)^(-) (iii) underset("[Nitrate]")(NO_(3)^(-))overset([C])rarr underset("[Molecular Nitrogen]")(N_(2)) In the above equations [A], [B],[C] indicate the bacteria which is responsible for the reaction. Name them. (b) Define Denitrification. (c) Which enzyme is required for Nitrogen fixation ?
Answer» Solution :(a) (i) A - Nitrosomonas (ii) B - Nitrobacter (iii) C- Pseudomonas (b) Denitrification : NITRATES in the SOIL are converted back into atmospheric NITROGEN by a process called denitrification. Bacteria involved in this process are Pseudomonas, Thiobacillus and Bacillus subtilis. `"Nitrate"overset("Pseudomonas")rarr "Molecular Nitrogen"` (c) Enzyme REQUIRED for Nitrogen fixation : Nitrate Reductase, Nitrite Reductase