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

Volvox is a/an:

Consider the following statements:
$I.$ In red algae,vegetative reproduction takes place by fragmentation.
$II.$ In red algae,the food is stored as floridean starch,which is very similar to amylopectin and glycogen in structure.
$III.$ The cell wall of red algae consists of chitin.
Which of the statements given above are correct?

Chlamydomonas does not occur in

Pyrenoids are centers for the formation of . . . . . . .

What happens when a formalin-preserved $Spirogyra$ filament is placed in a hypertonic sugar solution?