C-12-Q175mediumsingle_mcqThe reaction NH2-CO-NH2+3H2O→ureaz2NH4++2OH−+CO2\mathrm{NH_2\text{-}CO\text{-}NH_2 + 3H_2O \xrightarrow{ureaz} 2NH_4^+ + 2OH^- + CO_2}NH2-CO-NH2+3H2Oureaz shows that plants absorb—aNO3−\mathrm{NO_3^-}NO3−bNH4+\mathrm{NH_4^+}NH