The thallus organisation of $Volvox$ 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?

The chloroplast in $Spirogyra$ is

Which of the following is $NOT$ a component of the algal cell wall?

In which of the following are Chlorophyll-$a$,Chlorophyll-$d$,and Phycoerythrin found?

Spermatia are the male gametes of ........