What is the stored food material in algae?

Read carefully the given statements about algae and choose the correct option.
$I$. The plant body is thalloid.
$II$. Mainly aquatic.
$III$. Reproduction takes place by vegetative,asexual,and sexual methods.
$IV$. Volvox and Ulothrix are the colonial forms of algae.

Read the following statements and identify the characters related to the alga shown in the diagram:
$(a)$ It is a member of Chlorophyceae
$(b)$ Food is stored in the form of starch
$(c)$ It is a monoecious plant showing oogonium and antheridium
$(d)$ Food is stored in the form of laminarin or mannitol
$(e)$ It shows dominance of pigments chlorophyll $a, c$ and Fucoxanthin.
Choose the correct answer from the options given below:

Hormogonia are the vegetatively reproducing structures of

Assertion : Members of Phaeophyceae vary in colour from olive green to various shades of brown.
Reason : Phaeophyceae possess chlorophyll $a, c$,carotenoids and xanthophylls.

Galactans and mannans are found in