Question

Callose thickening found in endothecium of anther wall is

• A. a polysaccharide made up of alpha glucose monomers
• B. a polysaccharide made up of beta glucose monomers
• C. a protein made up of mainly acidic amino acids
• D. a protein made up of mainly basic amino acids

Answer 1

Answer: (B)

Callose is polysaccharide having repeating units of beta glucose with $\beta \, \left(1 \rightarrow 3\right)$ glycosidic bonds with some $\beta \, \left(1 \rightarrow 6\right)$ branches. Callose is produced during pollen grain formation, cell plate formation and also as a stress response. Callose present in the endothecium helps in dispersion of pollen grains.