The filaments of $Spirogyra$ are:

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?

Identify the figure shown below.

Hormogonia are the vegetatively reproducing structures of

The disease known as "Red rust of tea" is caused by a parasite belonging to which of the following groups?

Which type of life cycle is exhibited by Fucus?