Which of the following is known as the primitive plant?

What happens when a formalin-preserved $Spirogyra$ filament is placed in a hypertonic sugar solution?

Volvox is a/an:

In the $Chlorophyta$ (green algae),the reserve food consisting of protein surrounded by starch forms a compact body termed:

In Hammerling's nucleocytoplasmic experiments,$Acetabularia$ is used,which is a:

The non-motile,greatly thickened asexual spores are called