Caia (plant)
Caia is a genus of small fossil plants of Late Silurian age (around 430 to 420 million years ago). The diagnostic characters are naked parallel-sided axes branching isotomously, terminating in vertically elongate sporangia (spore-forming organs) which bear spinous emergences particularly at the distal ends. Spores are trilete and retusoid. The only known species is from Hereford, England.
Cladistic analysis suggests that the genus may belong to the Horneophytopsida, a class of the polysporangiophytes, as it lacks vascular tissue and has branched stems bearing sporangia. For the cladogram, see the Horneophytopsida article.
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Plant
Plants, also called green plants, are multicellular eukaryotes of the kingdom Plantae. They form an unranked clade Viridiplantae (Latin for green plants) that includes the flowering plants, conifers and other gymnosperms, ferns, clubmosses, hornworts, liverworts, mosses and the green algae. Green plants excludes the red and brown algae, the fungi, archaea, bacteria and animals.
Green plants have cell walls with cellulose and obtain most of their energy from sunlight via photosynthesis by primary chloroplasts, derived from endosymbiosis with cyanobacteria. Their chloroplasts contain chlorophylls a and b, which gives them their green color. Some plants are parasitic and have lost the ability to produce normal amounts of chlorophyll or to photosynthesize. Plants are also characterized by sexual reproduction, modular and indeterminate growth, and an alternation of generations, although asexual reproduction is also common.
Precise numbers are difficult to determine, but as of 2010, there are thought to be 300–315 thousand species of plants, of which the great majority, some 260–290 thousand, are seed plants (see the table below). Green plants provide most of the world's molecular oxygen and are the basis of most of the earth's ecologies, especially on land. Plants that produce grains, fruits and vegetables form mankind's basic foodstuffs, and have been domesticated for millennia. Plants are used as ornaments and, until recently and in great variety, they have served as the source of most medicines and drugs. The scientific study of plants is known as botany, a branch of biology.
Plantà
The plantá (which comes from the verb to plant; in Valencian, plantà) is the act of erecting a Falla or bonfire monument, in the Fallas or the Bonfires of Saint John, festivals held respectively in March and June in different localities of the Community of Valencia (Spain).The plantà is currently considered the exact moment when the falla or bonfire is completely finished and ready to be visited, with all its “ninots” (human figures made of combustible materials, such as cardboard or wood, which has a critical or mocking nature), posters and a variety of features (lights, matted grass, interpretive signs...).
In the Fallas of Valencia, the plantá takes place on March 15, when all the Falla monuments must be positioned correctly. The reason is that the jury appointed by the Central Fallera committee has to go to the next day to assess the falla. Formerly, the plantà began and ended the same day but, due to the complexity of the monuments and the fact that the makers of Fallas are responsible for several Fallas monuments at the same time, it usually begins a few days before. The burning of the Falla or cremá is carried out four days later, on the night of March 19.
Plant (disambiguation)
A plant is a living organism that generally does not move and absorbs nutrients from its surroundings.
Plant may also refer to:
In manufacturing and engineering
In media and entertainment
In names
Caia
Caia may refer to:
Caia (river)
The Caia is a river in the Iberian Peninsula, a tributary to the Guadiana. It is one of the main water courses in the Portalegre District, Portugal. Portugal does not recognise the border between the Caia and Ribeira de Cuncos River deltas, since the beginning of the 1801 occupation of Olivenza by Spain. This territory, though under de facto Spanish occupation, remains a de jure part of Portugal, consequently no border is henceforth recognised in this area.
Course
It has its sources in the Serra de São Mamede and for the lower 11 kilometres (7 mi) of its course it forms the international Portugal-Spain border. Finally it joins the Guadiana River southwest of the city of Badajoz.
Tributaries
Dams
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952 Caia
952 Caia, provisional designation 1916 Σ61, is a large carbonaceous asteroid from the outer region of the asteroid belt, about 82 kilometers in diameter. It was discovered by Soviet–Russian astronomer Grigory Neujmin at the Crimean Simeiz Observatory on 27 October 1916.
The C-type asteroid orbits the Sun at a distance of 2.3–3.7 AU once every 5 years and 2 months (1,887 days). Its orbit shows an eccentricity of 0.25 and an inclination of 10 degrees from the plane of the ecliptic.
Two photoelectric light-curve observations from 1980 rendered a rotation period of 7.50 and 7.51 hours, while a more recent light-curve analysis in 2004 gave a period of 7000379500000000000♠3.795±0.001 hours (or half the previously determined period) with a very low brightness variation of 0.03 in magnitude, which typically indicates a nearly spheroidal shape. According to the surveys carried out by the Infrared Astronomical Satellite, IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid has a diameter between 81.6 and 88.8 kilometers and a low albedo in the range of 0.040 and 0.056. The Collaborative Asteroid Lightcurve Link agrees with the spaced-based observations and derives an albedo of 0.051 with a corresponding diameter of 81.5 kilometers.
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