Nitrogen fertilizer leaves ………salt residue after use on crops.
a) no
b) 10 %
c) 20 %
d) 30 %
Which element is present in urea.
a) N
b) O
c) C
d) all of these
The general formula of urea is …………..
a) NH2CONH2
b) NCONH2
c) NH3CO
d) NH4Cl
Fertilizer is any material ……which supplies one or more of chemical elements require for plant growth.
a) organic
b) inorganic
c) natural or synthetic
d) all of these
………are very essential for growth of plants.
a) P
b) K
c) N
d) all of these
The raw material used for the manufacture of urea are……………
a) ammonia
b) carbon dioxide
c) both a & b
d) none of these
