Match the following concerning essential elements and their functions in plants :

	Column I		Column II
(a)	Iron	(i)	Photolysis of water
(b)	Zinc	(ii)	Pollen germination
(c)	Boron	(iii)	Required for chlorophyll biosynthesis
(d)	Manganese	(iv)	IAA biosynthesis

Select the correct option :

	(a)	(b)	(c)	(d)
1	iv	iii	ii	i
2	iii	iv	ii	i
3	iv	i	ii	iii
4	ii	i	iv	iii

Iron is required for chlorophyll biosynthesis. Iron is not a constituent of the chlorophyll molecule itself. The iron requirement may be related to a more general need for iron in the synthesis of the chloroplast constituents, especially the electron transport proteins.

 Zn is required for IAA (auxin) biosynthesis. Zinc is required for synthesis of the hormone precursor tryptophan.

 Boron helps in pollen germination.  It is not known how boron is involved in cell growth.

Mn is essential for photolysis of water. The best known and most studied function of manganese is in photosynthetic oxygen evolution. In the form of a manganoprotein, manganese is part of the oxygen-evolving complex associated with photosystem II, where it accumulates charges during the oxidation of water.