For the limited nitrogen that is present in the soil,microbes compete with

Which mineral is present in milk?

Which one of the following is a wrong statement?

Match the following columns correctly:

Column $I$	Column $II$
$(a)$ Manganese	$(p)$ For $O_2$ evolution
$(b)$ Chlorine	$(q)$ Required for thyroid gland development
$(c)$ Phosphorus	$(r)$ High concentration in mitochondria
$(d)$ Iodine	$(s)$ Component of nucleic acids

$A$ farmer adds/supplies $Na, Ca, Mg$ and $Fe$ regularly to his field and yet he observes that the plants show deficiency of $Ca, Mg$ and $Fe$. Give a valid reason and suggest a way to help the farmer improve the growth of plants.

Match the following and choose the correct combination from the given options.

Column-$I$	Column-$II$
$(A)$ Potassium	$(1)$ Constituent of ferredoxin
$(B)$ Sulphur	$(2)$ Involved in stomatal movement
$(C)$ Molybdenum	$(3)$ Needed in the synthesis of auxin
$(D)$ Zinc	$(4)$ Component of nitrogenase