Identify the algae shown in the given figure.

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.

Which photosynthetic pigment is $NOT$ found in algae?

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

$A$ : Sexual reproduction shows considerable variation in the type and formation of sex cells in members of $Chlorophyceae$.
$R$ : It may be isogamous,anisogamous and oogamous.

In Chlorophyceae,which type of sexual reproduction is observed?