Iron is present in which of the following?

Which mineral element is essential for the repair of damaged cells?

Manganese and Zinc are essential for which process in our body?

Match the following:

Column-$I$	Column-$II$
$(a)$ Calcium	$(p)$ Ferredoxin
$(b)$ Phosphorous	$(q)$ $N_2$-metabolism
$(c)$ Iron	$(r)$ Meristematic tissue
$(d)$ Manganese	$(s)$ Cell membrane

$Mg^{2+}$ is an activator of:
$I.$ Alcohol dehydrogenase
$II.$ Nitrogenase
$III.$ Ribulose bisphosphate carboxylase oxygenase
$IV.$ Phosphoenol pyruvate carboxylase
Choose the correct option.

We know that plants require nutrients. If we supply these in excess,will it be beneficial to the plants? If yes,how? If no,why?