The agent/s which make/s free atmospheric nitrogen available to plants is/are:

Which of the following statements are incorrect?
$I.$ Hemoglobin,myoglobin,and cytochromes are iron-containing compounds.
$II.$ Copper is important for cell division in plants.
$III.$ Biotin and riboflavin are sulfur-containing vitamins.
$IV.$ Calcium is necessary for the structure of teeth and bones.
$V.$ Manganese is required in the structure of the phosphatase enzyme.

Ammonium sulphate is:

Study the following columns and choose the correct match.

Column-$I$	Column-$II$
$(A)$ Photolysis of water	$(1)$ Zinc
$(B)$ Diazotrophy	$(2)$ Copper
$(C)$ Cytochrome-c oxidase	$(3)$ Manganese
$(D)$ Biosynthesis of $IAA$	$(4)$ Molybdenum
	$(5)$ Boron

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

Which of the following is a free-living nitrogen-fixing bacterium?