In $Spirogyra$,during the germination of the zygospore,how many haploid nuclei take part in the formation of a new filament?

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.

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

In algae,the photosynthetic pigments are present in

Identify the figure.

The replicate septum of $Spirogyra$ is characterised by: