The filament of $Mastigocladus$ $laminosus$ is

Phycoerythrin and floridean starch are found in

$A$: Algae are autotrophic in terms of nutrition.
$R$: Algae contain chlorophyll and other photosynthetic pigments.

Describe the types of reproduction in red algae (Rhodophyceae).

Which of the following organisms cannot fix nitrogen?
$A.$ Azotobacter
$B.$ Oscillatoria
$C.$ Anabaena
$D.$ Volvox
$E.$ Nostoc
Choose the correct answer from the options given below:

Presence of a basal rhizoidal cell in $Ulothrix$ is an example of: