Which element is incorrectly matched with its function in the plant?

calcium -- formation of cell walls; maintenance of membrane integrity

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iron -- a cofactor for an enzyme in chlorophyll biosynthesis; constituent of the heme group of cytochromes

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magnesium -- component of chlorophyll

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molybdenum -- cofactor; principal divalent cation of cytosol; important in osmotic regulations

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Solution

The correct option is D
molybdenum -- cofactor; principal divalent cation of cytosol; important in osmotic regulations

Molybdenum is an essential component in two enzymes that convert nitrate into nitrite (a toxic form of nitrogen) and then into ammonia before it is used to synthesize amino acids within the plant. It also needed by symbiotic nitrogen fixing bacteria in legumes to fix atmospheric nitrogen.

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Similar questions

	Elements		Functions
(a)	Iron	(i)	Photolysis of water
(b)	Magnesium	(ii)	Required for chlorophyll biosynthesis
(c)	Chlorine	(iii)	Maintains anion cation balance
(d)	Manganese	(iv)	Helps to maintain ribosome structure

I	II
(A) Magnesium	(i) Found in middle lamella
(B) Sulphur	(ii) A structural component of chlorophyll
(C) Calcium	(iii) Required for enzyme activity
(D) Iodine	(iv) Found in some amino acids
(E) Manganese	(v) A component of sugars
	(vi) Not important for plants

	Column I		Column II
$(a)$	Magnesium	$(p)$	Found in some amino acids
$(b)$	Sulphur	$(q)$	Not important for plants
$(c)$	Iodine	$(r)$	Structural component or chlorophyll
$(d)$	Manganese	$(s)$	Component of sugar
		$(t)$	Required for enzyme activity

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