Sexual reproduction in $Spirogyra$ can be described as:

In $Ulothrix$,sexual reproduction is by

Which of the following algae produces carpospores?

The thallus organisation of $Volvox$ is

In $Ulothrix$,$Spirogyra$,and $Chlamydomonas$,at what stage does meiosis occur?

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?