Flores de Primavera material gratis para diseño
Flores de Primavera material gratis para diseño
bajar las ilustraciones mas lindas que hay en la web
La flor es la estructura reproductiva
característica de las plantas llamadas
espermatofitas o fanerógamas.
La función de una flor es producir semillas a
través de la reproducción sexual.
Para las plantas, las semillas son la
próxima generación, y
sirven como el principal
medio a través del cual las
especies se perpetúan y se propagan.
Todas las espermatofitas
poseen flores que producirán semillas,
pero la
organización interna de la flor
es muy diferente en los dos principales
grupos de espermatofitas:
las gimnospermas vivientes y las angiospermas.
Las
gimnospermas pueden poseer flores
que se reúnen en estróbilos, o bien la
misma flor puede ser un estróbilo
de hojas fértiles.
En cambio, una flor
típica de angiosperma
está compuesta por
cuatro tipos de hojas estructural y
fisiológicamente modificadas p
ara producir y proteger los gametos.
Tales
hojas modificadas o antófilos
son los sépalos, pétalos, estambres y
carpelos.
Además, en las angiospermas
la flor da origen, tras la
fertilización y por transformación
de algunas de sus partes,
a un fruto que
contiene las semillas.
El grupo de las angiospermas,
con más de 250.000 especies, es un linaje
evolutivamente exitoso que conforma
la mayor parte de la flora terrestre
existente.
La flor de angiosperma es el
carácter definitorio del grupo y es,
probablemente, un factor clave en su éxito evolutivo.
Es una estructura
compleja, cuyo plan organizacional
está conservado en casi todos los
miembros del grupo,
si bien presenta una tremenda diversidad e
n la
morfología y fisiología de todas y
cada una de las piezas que la componen.
La base genética y adaptativa
de tal diversidad está comenzando a
comprenderse en profundidad,
así como también su origen, que data del
Cretácico inferior,
y su posterior evolución en
estrecha interrelación con
los animales que se encargan de
transportar los gametos.
Con independencia de los aspectos
señalados, la flor es un objeto importante
para los seres humanos.
A través de la historia y de las diferentes
culturas, la flor siempre
ha tenido un lugar en las sociedades humanas, ya
sea por su belleza intrínseca
o por su simbolismo.
De hecho, cultivamos
especies para que nos provean
flores desde hace más de 5.000 años y,
actualmente, ese arte se ha transformado
en una industria en continua
expansión: la floricultura.
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