Sexual reproduction in $Spirogyra$ involves the fusion of:

How does asexual reproduction occur in $Spirogyra$?

The zygote containing $4$ meiospores in $Spirogyra$ is called

Consider the following statements:
$I.$ In red algae,vegetative reproduction takes place by fragmentation.
$II.$ In red algae,the food is stored as floridean starch,which is very similar to amylopectin and glycogen in structure.
$III.$ The cell wall of red algae consists of chitin.
Which of the statements given above are correct?

Haplontic life cycle is followed by:

The pigment phycoerythrin is characteristic of