A) Manganese, copper, calcium
B) Sodium, potassium, boron
C) Sodium, nickel, chlorine
D) Copper, molybdenum, zinc
Correct Answer: D
Solution :
Cu\[(6\mu m/gm)\], Zn\[(20\mu m/gm)\] and Mo\[(.1\mu m/gm)\]are required for plant growth.
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