179–190. Multicellular forms are those that appear filamentous or forming leaf-like thallus (e.g. Brown algae include those of the phylum Phaeophyta. Retrieved from https://biologydictionary.net/algae/. These organisms do not share a common ancestor and hence, are not related to each other (polyphyletic).”. Occurrence 5. This class of bacteria obtains energy through the process of. Some algal species form symbiosis with other organisms. Hence, these are also called nitrogen-fixing bacteria. Without algae, the rest of the food chain would collapse. Nostoc, Anabaena, etc. They are also used in the production of agar, which is used as a growth medium in microbiological studies. Algae can be either unicellular or multicellular organisms, Algae lack a well-defined body, so, structures like roots, stems or leaves are absent. Global demand for petroleum products and declining environmental health has prompted the use of eco-friendly alternatives such as algal biofuel. McMahon, M. J., Kofranek, A. M., & Rubatzky, V. E. (2011). The pigments phycocyanin and phycoerythrin are responsible for the characteristic red colouration of the algae. However, they are prokaryotes, and as such, other authorities do not consider them as algae. Your email address will not be published. Before using our website, please read our Privacy Policy. Algae, like grass and plants in the terrestrial world, is the base of the food-chain. There are many types of algae; however, these are some of the more prominent types: Also called Rhodophyta, it is a distinctive species found in marine as well as freshwater ecosystems. Algae, as a group, produce a vast majority of the oxygen on Earth. by osmotrophy, phagotrophy, and mixotrophy). Algae (singular: alga) are organisms that belong to Domain Eucarya and distinct from animals by being photosynthetic. Retrieved from Ufl.edu website. The pigments phycocyanin and phycoerythrin are responsible for the characteristic red colouration of the algae. (2019, April 17). Some of them also live in symbiosis, such as lichens. They may also form colonies. Blue-green algae (Cyanophyta) are not considered by others as algae but rather include them together with bacteria under Kingdom Monera. © 2001-2020 BiologyOnline. Although most algae are phototrophic (relying energy derivation from photosynthesis), others are mixotrophic, and others still, heterotrophic. In other words, they do not possess vascular tissue necessary for conduction of water and minerals. soil, rocks, and trees). E.g. You might be surprised, but there are even algae which have colonized the terrestrial environment. Helfman, G. S., Collette, B. Examples of red algae are Rhodella, Compsopogon, Stylonema, Bangia, Porphyra, Porphyridium cruentum, Hildenbrandia, Nemalion, Corallina officinalis, Ahnfeltia, Gelidium, etc. Even humans eat algae, in almost every culture and region near an ocean. However, since blue-green algae are prokaryotes, they are not currently included under algae (because all algae are classified as eukaryotic organisms). Algae Definition “Alga is a term that describes a large and incredibly diverse group of eukaryotic, photosynthetic lifeforms. Reproduction in algae occurs in both asexual and sexual forms. It is very useful to check the answers following question we type. First and foremost, algae represent the most potent source of oxygen in the atmosphere. CRC Press. However, they lack chlorophyll b or beta-carotene. Algae are generally harmless to humans. 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