- Algae - Encyclopedia. com
Algae Algae (singular: alga) are photosynthetic, eukaryotic organisms that do not develop multicellular sex organs Algae can be unicellular, or they may be large, multicellular organisms Algae can occur in salt or fresh waters, or on the surfaces of moist soil or rocks The multicellular algae develop specialized tissues, but they lack the true stems, leaves, or roots of the more complex
- Green Algae | Encyclopedia. com
green algae Large group of marine and freshwater algae (phylum Chlorophyta) They are distinct from other algae by virtue of possessing cup-shaped chloroplasts that contain chlorophyll b, and by producing cells with flagella at some stage in their lives Green algae range in size from microscopic single-cell types to large, complex seaweeds
- Pyrrophyta - Encyclopedia. com
Cryptomonads for instance, are considered red-brownish algae of Cryptomonadida Order by botanists, and protozoans of Cryptophycea Class by zoologists This controversy is due to the unusual characteristics of these two phyla, sharing features with both plants and animals
- Evolution of Plants - Encyclopedia. com
Evolution of Plants Plants, descended from aquatic green algal ancestors, first appeared on land more than 450 million years ago during or prior to the Ordovician period This event preceded the colonization of land by four-footed animals (tetrapods), which occurred considerably later in the Devonian period (408 to 360 million years ago) Understanding the origin of plants is important because
- Protista - Encyclopedia. com
Protista Background Classification Protozoa Algae Slime molds and water molds Disease-causing protists Beneficial protists Resources The kingdom Protista is the most diverse of all of the eukaryotic kingdoms It is certainly not monophyletic and its members really only share the fact that they have a simple structure, without any obvious tissues or organs There are more than 200,000 known
- Mushroom | Encyclopedia. com
Mushrooms Mushrooms are the fruiting bodies of certain species of higher fungi The vegetative tissues of these fungi consists of immense lengths of microscopic, thread-like hyphae, and their aggregations known as mycelium, which grow in surface soils, organic debris, and in association with plant roots Strictly speaking, a mushroom is the sporulating or fruiting body of a fungus in the
- Protozoa - Encyclopedia. com
Further complicating a precise definition of protozoa is the close relationship between some protozoa and unicellular algae Modern taxonomic treatments recognize these similarities and group protozoa, photosynthetic unicellular algae, and slime molds together as protists or protoctists
- Cyanobacteria - Encyclopedia. com
Cyanobacteria Cyanobacteria (blue-green algae [1]) are microorganisms that structurally resemble bacteria (they lack a nucleus and organelles ) However, unlike other bacteria, cyanobacteria contain chlorophyll a and conduct oxygenic photosynthesis
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