The given figure is useful in the structure of which molecule?

Statement $P$: $A$ water molecule must be added to form a complex organic substance.
Statement $Q$: $\text{Maltose} + H_2O \xrightarrow{\text{hydrolysis}} \text{Glucose} + \text{Glucose}$

Phosphorus is the major constituent of:
$I.$ Biological membranes
$II.$ Nucleic acids
$III.$ Cellular energy
Choose the correct option.

$A$ substance that prevents or delays oxidation is known as:

The vitamin theory was proposed by:

Select the correct match for $X$ and $Y$.

Column $X$	Column $Y$
$(1)$ Starch	$(P)$ Found in animal skeletal tissues
$(2)$ Glycogen	$(Q)$ Stored food form in plants
$(3)$ Chitin	$(R)$ Provides strength in sclerenchyma
$(4)$ Lignin	$(S)$ Stored food form in animals