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Second, many algae are unicellular, according to a article published in the journal Current Biology. They also occur in a variety of forms and sizes.
They can exist as single, microscopic cells; they can be macroscopic and multicellular; live in colonies; or take on a leafy appearance as in the case of seaweeds such as giant kelp.
Picoplankton are between 0. Lastly, algae are found in a range of aquatic habitats, both freshwater and saltwater. By virtue of these characteristics, the general term "algae" includes prokaryotic organisms — cyanobacteria , also known as blue-green algae — as well as eukaryotic organisms all other algal species.
These early cyanobacteria were engulfed by primitive plants cells sometime in the late Proterozoic, or in the early Cambrian period, according to the University of California Museum of Paleontology.
Prokaryotes include bacteria and archaea. They are simpler organisms without an organized cell structure and their DNA floats freely as a tangled mass within the cytoplasm.
On the other hand, eukaryotes are all other living organisms: protists , plants, fungi What Are Protists? Their cells are more organized. They have structures called organelles to execute a range of cellular functions and their DNA is housed in a central compartment called the nucleus.
The majority of algae live in aquatic habitats Current Biology, Yet, the word "aquatic" is almost limited in its ability to encompass the diversity of these habitats.
These organisms can thrive in freshwater lakes or in saltwater oceans. They can also endure a range of temperatures, oxygen or carbon dioxide concentrations, acidity and turbidity.
American Journal of Botany. Archived from the original on 27 February Archived from the original on 2 July Retrieved 25 August Farblose Algen.
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Sinha and V. Singh Botany for degree students algae. New Delhi: S. Chand and Company. Plant Physiology. Archived PDF from the original on 7 February Biology 8 ed.
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Textbook of Algae. Historia Fucorum. Petersburg: Ex typographia Academiae scientiarum — via Google Books.
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Algarum unicellularium genera nova et minus cognita, praemissis observationibus de algis unicellularibus in genere New and less known genera of unicellular algae, preceded by observations respecting unicellular algae in general Archived 20 April at the Wayback Machine.
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London: Elsevier Academic Press. The Ecology of Algae. Retrieved 6 February Archived from the original on 11 November Bibcode : Natur.
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Algae have many types of life cycles, and they range in size from microscopic Micromonas species to giant kelps that reach 60 metres feet in length.
Their photosynthetic pigments are more varied than those of plants , and their cells have features not found among plants and animals.
In addition to their ecological roles as oxygen producers and as the food base for almost all aquatic life, algae are economically important as a source of crude oil and as sources of food and a number of pharmaceutical and industrial products for humans.
The taxonomy of algae is contentious and subject to rapid change as new molecular information is discovered. The study of algae is called phycology , and a person who studies algae is a phycologist.
In this article the algae are defined as eukaryotic nucleus-bearing organisms that photosynthesize but lack the specialized multicellular reproductive structures of plants, which always contain fertile gamete -producing cells surrounded by sterile cells.
Algae also lack true roots , stems , and leaves —features they share with the avascular lower plants e. Additionally, the algae as treated in this article exclude the prokaryotic nucleus-lacking blue-green algae cyanobacteria.
Mp Guna. Show More. No Downloads. Views Total views. Actions Shares. No notes for slide. Algae 1. Some places where they grow are tree trunks and animal fur.
They can exist as single and microscopic cells, they can be macroscopic and multicellular. Flagella is absent.
Algae can be grown using water resources such as brackish-, sea-, and wastewater unsuitable for cultivating agricultural crops. When using wastewater, such as municipal, animal and even some industrial runoff, they can help in its treatment and purification, while benefiting from using the nutrients present.
Algae are very diverse and found almost everywhere on the planet.