Agar is commercially obtained from $..........$.

Which of the following is incorrectly matched?

The members of $Rhodophyceae$ are commonly called Red algae because of the:

Which of the following components are present in the cell wall of algae?
$(1)$ Cellulose $(2)$ Protein $(3)$ Galactans $(4)$ Mannans $(5)$ Suberin
$(6)$ Pectin $(7)$ Hemicellulose $(8)$ Calcium carbonate

Which of the following pairs is incorrect?

From which of the following algae,agar-agar is commercially extracted?
$I.$ Gracilaria $II.$ Fucus $III.$ Sargassum $IV.$ Gelidium $V.$ Turbinaria