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