Which of the following are a group of micronutrients for plants?
(a) Fe, Mn, Cu, Mo, Zn
(b) Fe, Mn, Cu. O, C
(c) Cu, B, Cl, Fe, Ca
(d) Ca, Mg, Fe
(a) : Micronutrients or trace elements are needed in very small amounts (less than 10 mmole kg-1 of dry matter). These are 8 in number and include iron, manganese, copper, molybdenum, zinc, boron, chlorine and nickel.