Question

Blue-green algae are members of
A. Monera
B. Protista
C. Fungi
D. Plantae.

Answer 1

Hint: For enhanced and systematic studies, all living organisms have been grouped under various categories as per their characteristics. Such classification includes various categories such as kingdoms, species, phylum, etc.

Complete Answer
Monera: Monera is one of the five kingdoms. It includes unicellular organisms that are prokaryotic by nature, that is, they do not have a well defined enveloped nucleus. Blue green algae is a unicellular, prokaryotic organism. Thus, they are absolutely appropriate to be grouped as a Morneas. Therefore, we can say that option A is the correct answer.
Protista: This is another category of kingdoms in which unicellular organisms are grouped together. However, unlike the latter they are eukaryotic organisms by nature that is, they do have proper nucleated cell structure. Common algae is an example of Protists. Thus, we can say that option B, is an incorrect answer as it does not match with characteristics of a Blue green algae.
Fungi: It is another category of kingdoms in which organisms share characteristics such as eukaryotes, micro-sized individuals that can be either saprophytic or autotrophic by nature. They are quite unique organisms as they have a vast variety of species amongst them. Yeasts are the best examples of fungi.
Plantae: It is another category of kingdoms in which green plants are grouped together. Individuals of this group are well capable of making their food by photosynthesis thus, are also called autotrophs. Any green plant such as Mango can be taken as an example of a plant.

Hence option A is the correct answer.

Note:
Blue green algae is one of the most advanced and successful organisms that has managed to survive almost all environmental mediums such as water, tree trunks, moist surfaces (rocks, soil), etc. It is involved in nitrogen fixation processes.