Which of the following is an incorrect characteristic of brown algae?

Mannitol is the stored food in $..........$.

Non-motile gametes are characteristically found in

Consider the following statements:
$I$. They reproduce asexually by non-motile spores and sexually by non-motile gametes.
$II$. In this class,sexual reproduction is oogamous and accompanied by complex post-fertilisation developments.
$III$. The common members are $Polysiphonia$,$Porphyra$,$Gracilaria$ and $Gelidium$.
The above characteristics belong to which class of algae?

Which of the following pairs consists of unicellular algae?

The structure of Floridean starch is similar to: