$A$ cell of $Ulothrix$ has how many chloroplasts?

The cell wall of algae is made up of . . . . . . .

Mannitol is the stored food in

Identify the algae given below.

Physiological anisogamous sexual reproduction is found in

Consider the following statements regarding reproduction in class-$Chlorophyceae$.
$I.$ Asexual reproduction is mainly by flagellated zoospores produced in zoosporangia.
$II.$ The sexual reproduction shows considerable variation in the type and formation of sex cells and it may be isogamous,anisogamous and oogamous.
Which of the statements given above are correct?