Grey spots on oats are caused by the deficiency of which element?
- A$Fe$
- B$Cu$
- C$Zn$
- D$Mn$
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Death of leaf tissues in plants is caused by the deficiency of:
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| $P$. Chlorosis | $I$. $Ca, Mg, Cu, K$ |
| $Q$. Necrosis | $II$. $N, S, Mo$ |
| $R$. Inhibition of cell division | $III$. $N, K, Mg, S, Fe, Mn, Zn, Mo$ |
| $S$. Delay in flowering | $IV$. $N, K, S, Mo$ |
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