Which of the following plants are non-embryophytes?

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?

Define the following terms:
$(i)$ Anisogamous
$(ii)$ Oogamous

In Rhodophyceae,stored food is available as:

What is the cell wall of $Spirogyra$ made of?

How does asexual reproduction occur in $Spirogyra$?