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cyanobacteria
cyanobacteria or blue-green algae, photosynthetic bacteria that contain chlorophyll. For many years they were classified in the plant kingdom along with algae , but discoveries made possible by the electron microscope and new biochemical techniques have shown them to be prokaryotes more simi...
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blue-green algae
blue-green algae popular name for those microorganisms that are now more properly called cyanobacteria .
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Monera
Monera taxonomic kingdom that comprises the prokaryotes ( bacteria and cyanobacteria ). Prokaryotes are single-celled organisms that lack a membrane-bound nucleus and usually lack membrane-bound organelles (mitochondria, chloroplasts; see cell , in biology). They have a small ring of DNA as thei...
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Rhodophyta
Rhodophyta , phylum (division) of the kingdom Protista consisting of the photosynthetic organisms commonly known as red algae . Most of the world's seaweeds belong to this group. Members of the division have a characteristic clear red or purplish color imparted by accessory pigments called phyc...
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Gymnosperms
Gymnosperms
Gymnosperms are a group of plants that share one common characteristic: they bear seeds, but their seeds do not develop within an ovary. For this reason, gymnosperms were long thought to be an evolutionary precursor to the angiosperms, which are seed plants that enclose their seeds in a...
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lichen
lichen , usually slow-growing organism of simple structure, composed of fungi (see Fungi ) and photosynthetic green algae or cyanobacteria living together in a symbiotic relationship and resulting in a structure that resembles neither constituent. There are about 25,000 species, most comprised ...
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marine biology
marine biology study of ocean plants and animals and their ecological relationships. Marine organisms may be classified (according to their mode of life) as nektonic, planktonic, or benthic. Nektonic animals are those that swim and migrate freely, e.g., adult fishes , whales , and squid . Plankt...
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algae
algae [plural of Lat. alga =seaweed], a large and diverse group of primarily aquatic plantlike organisms. These organisms were previously classified as a primitive subkingdom of the plant kingdom, the thallophytes (plants that lack true roots, stems, leaves, and flowers). More recently, most alg...
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nitrogen cycle
nitrogen cycle the continuous flow of nitrogen through the biosphere by the processes of nitrogen fixation, ammonification (decay), nitrification, and denitrification. Nitrogen is vital to all living matter, both plant and animal; it is an essential constituent of amino acids, which form proteins...
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seaweed
seaweed name commonly used for the multicellular marine algae . Simpler forms, consisting of one cell (e.g., the diatom ) or of a few cells, are not generally called seaweeds; these tiny plants help to make up plankton. The more highly developed types of seaweed usually have a basal disk, called ...
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