Which among the following is the simplest sugar?

Write two main functions of carbohydrates in plants.

$A$ $D$-aldotetrose on oxidation with concentrated $HNO_3$ resulted in an optically inactive dicarboxylic acid. The structure of the $D$-aldotetrose is:

Which examples of carbohydrates exhibit $\alpha$-link,($\alpha$-glycosidic link) in their structure?

To become a carbohydrate,a compound must contain at least

If a monosaccharide contains a keto group,it is known as: