What are glucose and mannose to each other?

Carbohydrates are essential for life in both plants and animals. Name the carbohydrates that are used as storage molecules in plants and animals,and also name the carbohydrate which is present in wood or in the fibre of cotton clothes.

Two forms of $D$-glucopyranose are obtained from the solution of $D$-glucose. What are these called?

$D$-glucose upon treatment with bromine-water gives:

Raffinose is

Which one of the following statements is not true?