'Die back' of citrus and 'reclamation' of legumes and cereals is due to the defficiency of: ( Kindly explain briefly about the diseases also, if possible )

​a) Copper
b) Zinc
c) Sodium 
d) Molybdenum

Dear Student.
Please find below the solution to the asked query.

The correct answer is a). Copper.

Leaves on branches of citrus having copper deficiency wilt, turn brown and die. The bark becomes rough and release a gummy substance. The condition is known as die back of citrus.
In reclamation of cereals and legumes, the leaf tip becomes chlorotic and the seed fails to mature.
 
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