Why aren't cyanbacteria and grenn algae classified as a plant?

Answer 1

Cyanobacteria and green algae are not considered to be plants due to several reasons. First, they are prokaryotic, meaning they are unicellular in nature. Second, they do not contain cellulose in their cell walls, like plants do. Thirdly, their DNA is "naked", and not condensed into chromosomes like plants. One final reason is that they reproduce through binary fission, much like bacteria do.