ALGAE
Výukový materiál OR 03 - 65Tvůrce: Mgr. Alena Výborná
Tvůrce anglické verze: Mgr. Miloslava DorážkováProjekt: S anglickým jazykem do dalších předmětů
Registrační číslo: CZ.1.07/1.1.36/03.0005Tento projekt je spolufinancován ESF a SR ČR
ALGAE
•Algae and blue-green algae are the oldest organisms on our planet
•Autotrophic•Photosynthesis oxygen into
the atmosphere•An eukaryotic type of a cell•The simplest plants•They mainly occur in water (freshwater,
seawater), humid soil
ALGAE•They are an important part of food of
aquatic animals•Some of them occur even on dry land
(humid places)• a green cover on soil or
bark•A diverse cell structure and a way of life•They differ in:
▫Size▫Colour▫Body structure (a thallus)
ALGAE
GREEN ALGAE
•Predecessors of more developed plants•Seawater, freshwater and humid places•Some of them move thanks to flagellas
GREEN ALGAE
•Chlorophyceae▫Unicellular▫Without a flagellum
•Chlorophyta ▫Unicellular▫Humid places
GREEN ALGAE•Euglena
▫Unicellular▫Has a flagellum▫Mixotrophic (performs photosynthesis +
accepts dissolved organic substances from the surroundings)
•Volvox globator▫Unicellular▫Has a flagellum▫Makes colonies
Volvox globator• A colony of a volvox
globator
Euglena• A stigma• Chloroplasts• A nucleus• A flagellum
MULTICELLULAR ALGAE
•They are divided into several sections•They differ in:
▫Thallus structure▫Way of reproduction▫Way of life
MULTICELLULAR ALGAE
•They occur on rock coasts or freely in the sea:▫Brown algae▫Red algae
•Some of them grow into big sizes•Usage :
▫Feed▫Food ▫Essences from algae are used for
treatments
MULTICELLULAR ALGAE
•The largest brown algae are:•FUCUS (SEAWEED)•In our country there occur these green
fungi:•SPIROGYRA (a spiral chloroplast)•CLADOPHORA
MULTICELLULAR ALGAE – Thalli of sea algae visible just by an eye – red algae and seaweed
REVISION:
•1) Why are algae so important for us?
•2) Where do algae occur?
•3) The largest green algae are called:
•4) Which alga makes colonies?
Source:• DOBRORUKA, Luděk J. Přírodopis pro 7. ročník základní
školy. 1. vyd. Praha: Scientia, 1998, 152 s. ISBN 80-718-3134-4
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