The functional groups involved in the conversion of glucose to gluconic acid and gluconic acid to saccharic acid respectively are

From the following, the correct statements about polysaccharides are

I. Starch is a polymer of $\alpha-\mathrm{D}(+)$-glucose.

II. Amylose component of starch is not soluble in water.

III. Amylose is a branched chain polymer of $\alpha-\mathrm{D}(+)$-glucose.

IV. Cellulose is a straight chain polymer of $\beta-\mathrm{D}(+)$-glucose units.

The deficiency of which vitamin causes pernicious anaemia?

A vitamin $X$ is soluble in fat and its source is egg yolk. Deficiency of $X$ causes the disease