primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves
Plural form of alga.
Algae are a very large and diverse group of simple, typically autotrophic organisms, ranging from unicellular to multicellular forms, such as the giant kelps that grow to 65 meters in length. Most are photosynthetic and "simple" because they lack the many distinct cell and organ types found in land plants. The largest and most complex marine forms are called seaweeds. Though the prokaryotic cyanobacteria are informally referred to as blue-green algae, this usage is incorrect since they are regarded as bacteria. The term algae is now restricted to eukaryotic organisms. All true algae therefore have a nucleus enclosed within a membrane and plastids bound in one or more membranes. Algae constitute a polyphyletic group since they do not include a common ancestor, although their plastids seem to have a single origin. Diatoms are also examples of algae. Algae exhibit a wide range of reproductive strategies, from simple, asexual cell division to complex forms of sexual reproduction. Algae lack the various structures that characterize land plants, such as the leaf-like phyllids of bryophytes, rhizoids in nonvascular plants, and the roots, leaves, and other organs that are found in tracheophytes. Many are phototrophic, although some groups contain members that are mixotrophic, deriving energy both from photosynthesis and uptake of organic carbon either by osmotrophy, myzotrophy, or phagotrophy. Some unicellular species rely entirely on external energy sources and have limited or no photosynthetic apparatus.
U.S. National Library of Medicine
A major group of polyphyletic organisms of extremely varied morphology and physiology, mostly photosynthetic, but distinguished from plants by their complex form of sexual reproduction. They are freshwater and marine, terrestrial and subterranean; some are neustonic (living at the interface of water and the atmosphere). They live in various protozoa and within other plants. They live also in soil and on soil surfaces, on long-persistent snows, and in Antarctic rocks. Thermophilic algae inhabit hot springs. (From Webster, 3d ed; from Bold & Wynne, Introduction to the Algae, 2d ed, pp1-6)
A type of marine or aquatic organism or plant created and cultivated in various colors and species.
Algae grow in various places e.g. underwater in a coral reef, beside or in a pond or lake.
The numerical value of algae in Chaldean Numerology is: 4
The numerical value of algae in Pythagorean Numerology is: 8
Sample Sentences & Example Usage
Bacteria and algae can begin to grow and disease can set in, prompting farmers to use drugs and other chemicals that can remain on the shrimp and seep into the surrounding environment.
Limpets need high-strength teeth to rasp over rock surfaces and remove algae for feeding when the tide is in, we discovered that the fibres of goethite are just the right size to make up a resilient composite structure.
This is indicative of unusual conditions this year, especially this early in the year, we have low water flows, which makes the lower Willamette very lake-like. The water temperatures are high, and nutrient levels could feed algae.
The breccia looks like a solid rock, but it's made up of a bunch of chunks of other rocks. There are a ton of fossils in it, different kinds of sponges and brachiopods and also some algae, once you get a sense of how it weathers, your eye gets drawn to it in the mountain ranges.
If we looked at these warming rates, a project of what would happen in the next century then what we would see is that algal blooms would go up by about 20 percent, this is the green algae that you see in the lakes, often times in the summer and some of that green algae that is added, some of it contains harmful toxins and so what it can do is, it puts restrictions on people going out on the water or using the water for drinking purposes and things like that. So, there are real consequences to the actual lake ecosystem.
Images & Illustrations of algae
Translations for algae
From our Multilingual Translation Dictionary
Get even more translations for algae »
Find a translation for the algae definition in other languages:
Select another language: