Question

Blue green algae are:
A. Actinomycetes
B. Eukaryotes
C. Prokaryotes
D. Acellular

Answer 1

Prokaryotic and eukaryotic cells are the types of cells. A prokaryotic cell is a single-celled (unicellular) organism with no nucleus or other membrane-bound organelles. Prokaryotes are organisms that are mostly single-celled and belong to the domains Bacteria and Archaea. A eukaryotic cell is one that has a membrane-bound nucleus as well as other membrane-bound compartments or sacs, known as organelles, that perform specific duties. Eukaryotes include animal cells, plant cells, fungus, and protists.

Complete explanation:
Option A: Actinomycetes are Gram-positive, unicellular bacteria that belong to the Actinomycetales order. Members of this family are extensively spread in nature and can be found in a wide range of habitats.
So, option A is incorrect.
Option B: Eukaryotic organisms are huge and complex organisms having a nucleus encased within the nuclear membrane. Examples include protozoa, fungus, plants, and mammals.
So, option B is incorrect.
Option C: Prokaryotes are single-celled creatures that lack membrane-bound organelles such as mitochondria and the Golgi complex. They don't have a true nucleus. Instead, they have nucleoid genetic material that isn't encased in a nuclear envelope. Bacteria and Cyanobacteria are examples of prokaryotes (Blue green algae). Photosynthetic bacteria make up blue green algae.
So, option C is correct.
Option D: Acellular microorganisms include viruses, viroids, and prions. These organisms are deemed non-living outside of the living host cell because they behave like inert particles, but they can proliferate and behave like living creatures inside the host cell.
So, option D is incorrect.

Hence, Option C is the correct answer.

Note:
Cyanobacteria are a phylum of Gram-negative bacteria that use photosynthesis to gain energy. Because of their colour, they're also known as "blue-green algae". They appear to have originated in either freshwater or on land. Cyanobacteria, unlike heterotrophic prokaryotes, have interior membranes. These are flattened sacs called thylakoids where photosynthesis is done. Cyanobacteria are a category of photosynthetic bacteria that thrive in a wide range of moist soils and water, either freely or symbiotically with plants or lichen-forming fungus. They contain colonial species and range from unicellular to filamentous.