Name the deficiency symptoms shown by plants and their causative elements.

(N/A) $\Rightarrow$ Chlorosis: It is the loss of chlorophyll leading to the yellowing of leaves. It is caused by the deficiency of $N, K, Mg, S, Fe, Mn, Zn$ and $Mo$.
$\Rightarrow$ Necrosis: It is the death of tissues,particularly leaf tissue. It is caused by the deficiency of $Ca, Mg, Cu$ and $K$.
$\Rightarrow$ Retarded growth of plant: It involves the inhibition of cell division. It is caused by the deficiency of $N, K, S$ and $Mo$.
$\Rightarrow$ Delayed flowering: $A$ low level or lack of $N, S$ and $Mo$ causes delayed flowering in plants.
$\Rightarrow$ Inhibition of cell division: It is caused by the deficiency of $N, K, S, Mo$ and $Cl$.