Which photosynthetic pigments are present in algae?

Zygotic meiosis is a characteristic of .......

The chloroplast in $Spirogyra$ is

Identify $X$ and $Y$ in the given figure.

What is $Chlamydomonas$?

Consider the following statements regarding the major pigments and stored food in the different groups of algae and choose the correct option:
$(i)$ In Chlorophyceae,the stored food material is starch and the major pigments are chlorophyll $-a$ and $d$.
$(ii)$ In Phaeophyceae,laminarin is the stored food and major pigments are chlorophyll $-a$ and $b$.
$(iii)$ In Rhodophyceae,floridean starch is the stored food and the major pigments are chlorophyll $-a, d$ and phycoerythrin.