Identify the diagrams shown below:

Apart from chlorophyll, algae and cyanobacteria have several other pigments. Which pigments are found in blue-green algae $(BGA)$, red algae, and brown algae, that are responsible for their characteristic colours?

Assertion $(A)$: Algae are found in various colors.
Reason $(R)$: Algae contain different types of pigments.

Which one of the following shows isogamy with non-flagellated gametes?

Which of the following is an algal parasite?

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?