A) Mn, Ni and Zn
B) 0, Cu and B
C) Mg, Mn and Mo
D) Ca, S and Fe
Correct Answer: A
Solution :
The elements which are required by the plants in a very small amount (less than 10m mole Kg -1 of dry matter) are called as micro elements or trace elements. These include iron, manganese, copper, molybdenum, zinc, boron, chlorine and nickel.
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