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Repasar los ciclos biológicos de los vegetales (ciclos diploaploides)
Material:
-
Ramas de musgo
-
Hojas de helechos
-
Lupa
-
Foco de luz
-
Pinzas
-
Portaobjetos
-
Cubreobjetos
-
Agua
-
Microscopio
Proceso:
&Filamento
&Urna situada al final del filamento compuesta por una cofia y un esporángeo con tapadera (opérculo) que se desprende para liberar las semillas.
&Observar con una lupa ayudándonos con un foco de luz.
-
Extraer unas hojas de helechos
-
Raspar sobre un portaobjetos el envés de la hoja para desprender los esporángeos.
-
Añadir una gota de agua a la muestra.
-
Ponerle un cubreobjetos.
-
Observar con microscopio las estructuras circulares que se encuentran en el envés de la hoja.
-
Estas estructuras circulares son pequeños soros dotados de:
&Una membrana externa.
&Esporángeos que almacenan las esporas y se encuentran debajo de la membrana, estos esporángeos son anillos mecánicos.
Resultados:
Silvia Sepúlveda 1ºBachillerato G
6ª Práctica Fecha: 07/02/02
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Enviado por: | Chivi |
Idioma: | castellano |
País: | España |