Which one does not have eukaryotic organisation?
A. Green algae
B. Blue green algae
C. Red algae
D. Golden brown algae

Hint: Prokaryotes are unicellular organisms that don’t have bound organelles and lack a nucleus. Eukaryotes are multicellular creatures which have membrane bound organelles and true nucleus.

Complete answer:
Blue green algae may have a few likenesses to green plants yet basically they are more like Monerans. Cyanobacteria or blue green algae have following characteristics which shows that they don't have eukaryotic organisation, firstly Blue green algae are prokaryotes and don't contain a true nucleus. Secondly, blue green growth like Monerans likewise have an inflexible thick peptidoglycan cell wall. Moreover, the adhesive sheath encompassing the cell of blue green algae and the case present in numerous Monerans represents a comparative structure. In addition, like the Monerans, blue green algae duplicate asexually. Blue green algae additionally fix the environmental nitrogen like different individuals from Kingdom Monera. In the same way as other Bacteria that discharge the bacterial poison, blue green algae likewise discharge poisons that are destructive to aquatic life.

So, the correct answer is option “B” i.e.Blue green algae.

Note: The above mentioned characters depicts clearly that the blue green shows the characters or features more like that of monerans i.e, prokaryotes than eukaryotes so the correct answer is 'Blue green algae. Examples of prokaryotes include bacteria and the example of eukaryotes include Green algae, red algae, golden brown algae as more structurally complex (compartmentalized) a cell needs to be in order to carry out life functions.