Name a plant which accumulates silicon.

Identify the correct pair:

Column-$I$	Column-$II$
$P$. Phosphorus	$I$. Splitting of water to liberate oxygen during photosynthesis
$Q$. Potassium	$II$. Constituent of cell membranes and all nucleotides
$R$. Magnesium	$III$. In more abundant quantities in the meristematic tissue,buds,leaves,and root tips
$S$. Manganese	$IV$. Constituent of the ring structure of chlorophyll and helps to maintain the ribosome structure

$P - Q - R - S$

Match the following columns:

Column-$I$	Column-$II$
$(A)$ Water splitting reaction	$(1)$ Boron
$(B)$ Uptake and utilisation of $Ca^{2+}$	$(2)$ Copper
$(C)$ Synthesis of auxin	$(3)$ Chlorine
$(D)$ Redox reaction	$(4)$ Zinc

Nitrogen is required mainly by which of the following parts of the plants?
$I.$ Meristematic tissues
$II.$ Differentiating tissues
$III.$ Apical tissues
$IV.$ Metabolically active cells
Choose the correct option.

Phosphorus is required for making
$I.$ shell
$II.$ bones
$III.$ teeth
Choose the correct option

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