What is the general ratio of $C$,$H$,and $O$ in the structure of monosaccharides?

Which of the following is an example of a monosaccharide?

Which of the following is correctly matched?

$A$ person who eats rice,their diet contains ......

Pentoses and hexoses are the most common:

In potato tubers,the reserve food is starch. It is stachyose in $Stachys$ ($Chinese$ $artichoke$) tubers. In Jerusalem artichoke ($Helianthus$ $tuberosus$),the reserve food is in the form of fan-shaped crystals composed of: