a. The links joining monosaccharide residues in a polysaccharide are called bonds.

 Glycosidic bonds.

Explanation:d

Glycosidic bonds are covalent bonds that  join monosaccharides or longer glucose chains to other monosaccharide or carbohydrates to form disaccharides, oligosaccharides and polysaccharides and are named according to the type  of the atom present on the second carbohydrate to be linked. The bond is usually  formed between the hemiacetal of  the first carbohydrate and the functional  group on the second molecule which could be Oxygen-, Nitrogen-Sulphur -, and Carbon -glycosidic bonds.

Examples of  Polysaccharides are Cellulose Starch , Glycogen  formed by the linkage of many long residue monosaccharides connected through  glycosidic bonds.

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