Identify the algae given below.

What is a coenobium?

$Acetabularia$ is a:

Which of the following is not related to the thallus of members of $Phaeophyceae$?

The sexual reproduction in $Spirogyra$ is:

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?