High concentration of which of the following causes leaf curling, leaf – McqOptions

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1.	High concentration of which of the following causes leaf curling, leaf drop and reduced leaf size in plants? (PTET Feb 2011)
A.	\[S{{O}_{2}}\]
B.	Co
C.	\[N{{O}_{2}}\]
D.	None of these
Answer» D. None of these

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