The structural lipid of the cell is .......

Assertion $(S)$: In the structure of lipids,one to three molecules of fatty acids are attached to one molecule of alcohol.
Reason $(R)$: Alcohol is present in the structure of lipids in the form of trihydroxy alcohol or monohydroxy alcohol.

What type of fatty acid is $Oleic$ $acid$?

In an experiment,freshly hatched larvae of an insect (Khapra beetle) were reared on a basal diet (complete diet without cholesterol) with increasing amounts of cholesterol. Results obtained are shown in the given graph.
The graph indicates:

Waxes do not contain glycerol in their structure,but instead contain which type of alcohol?

Match the lipids given in Column-$I$ with their occurrence in Column-$II$.

Column-$I$	Column-$II$
$i$. Cerebrosides	$a$. Most of the cells in animal body
$ii$. Waxes	$b$. Dioscorea
$iii$. Diosgenin	$c$. Myelin sheath
$iv$. Cholesterol	$d$. Sebaceous glands of the skin