The most common asexual structure produced in algae is:

The members of $Rhodophyceae$ are commonly called Red algae because of the:

The thallus of $Volvox$ is called

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?

Which plants are known as primitive plants?

Which of the following pairs consists of unicellular algae?