Which one is the most rigid? cellulose, agar, amylose, xanthan gum, amylipectin or guar gum?

The most rigid is - cellulose

Explanation:

cellulose -

The reason for the rigidity of the cellulose is the hydrogen bond formation.

Cellulose are organic compounds, which have the formula of

Cellulose is an organic compound with the formula (C ₆H₁₀O₅) ₙ,

It is a polymer, and many monomers join together in a linear fashion to form cellulose.

Cellulose is abundantly present on Earth, in the cell wall of green plants.

cellulose forms rod - like structure, that form hydrogen bonding, which increases the strength of the cellulose.