Which of the following produces non-motile gametes?

The reserve food material in algae is:

Match the following columns:

Column-$I$	Column-$II$
$P$. Oogamous	$I$. Spirogyra,Chlamydomonas
$Q$. Anisogamous	$II$. Volvox,Fucus
$R$. Isogamous	$III$. Some species of Chlamydomonas

Assertion : Volvox,Ulothrix,Spirogyra and Chara are members of Chlorophyceae.
Reason : Usually they have a rigid cell wall made of an inner layer of cellulose and an outer layer of pectose.

Agar,which is required for the synthesis of ice cream and jelly,is obtained from:

Identify the given red algae.