Which statement about ribose is incorrect?

Assertion $A$: Starch is a homopolymer of glucose.
Reason $R$: Digestion of starch yields glucose.
Which option is correct for Assertion $A$ and Reason $R$?

What is the general formula for polysaccharides?

Sucrose is a $.......$.

Which monosaccharide does not exhibit optical isomerism?

$A$: Monosaccharide molecules cannot be hydrolyzed into simpler forms.
$R$: Monosaccharide is a simple sugar consisting of a single unit.