For Natural Polymers Polydispersity Index Is Equal to?

For natural polymers, PDI value is always equal to unity.

What is the polydispersity index of natural polymers?

PDI means polydispersity index. In polymer language this usually refers to ratio of weight average molecular weight (Mw) to number average (Mn) sometimes also called as molecular weight distribution. PDI is used to indicate distribution of polymer chain molecular weights in a given polymer.

Which polymer has PDI value is equal to 1?

So, in the given option, cellulose is a natural polymer, hence its ODI poly disparity index is equal to $1$.