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GYMNOSPERMS Výukový materiál OR 03 - 86 Tvůrce: Mgr. Alena Výborná Tvůrce anglické verze: ThMgr. Ing. Jiří Foller Projekt: S anglickým jazykem do dalších předmětů Registrační číslo: CZ.1.07/1.1.36/03.0005 Tento projekt je spolufinancován ESF a SR ČR GYMNOSPERMS • • • • • • „naked“ seeds = seeds without case they are covered only by testa they do not create the right flowers flowers are substituted by cones cones are usually lignifying and unisexual eggs have no packaging GYMNOSPERMS • eggs sitting on the scales of the cones • easily accessible for pollen grains • pollen grains disseminated by wind= anemogamic plants • seeds of most conifers are spread by wind • yew, juniper and gingko produces seeds with fleshy parts - spread by animals CYCADS • • • • • ancient group the first plants at the end of the Palaeozoic the most widespread in the Mesozoic nowadays, only a few species mostly in Southeast Asia CYCADS GINGKOS • • • • • • • • close relatives of conifers living fossils the biggest development in the Mesozoic nowadays only one type – ginkgo biloba origin in eastern China it is grown in parks and gardens in our country dioecious tree deciduous leaves GINGKOS • leaves resemble the shape of a small fans • seeds resemble drupes CONIFERS • • • • the narrow needle-like leaves trees mostly evergreens the group includes the largest trees in the world - redwood • trees with racemose branches • resin ducts leading stem CONIFERS • • • • • reproduction: eggs are without packaging they are placed on the scales cones can lignify woody cones = cone responds to humidity (it opens with dry) CONIFERS • • • • occurance: frigeophilic (cold-liking) trees they grow even on poor soils they reached its greatest development in the Mesozoic CONIFERS • • • • • • • representatives: Norway spruce forest pine silver fir common larch common juniper red yew Revision: • 1) To what plant group are conifers classified? ▫ Gymnosperms. • 2) Do egg have packaging? ▫ No, they have not. • 3) How are the seeds of the yew, juniper and gingko spread ? ▫ By animals • 4) Where is the origin of gingko bilba? ▫ Eastern China • 5) Ancient group of gymnosperms is… ▫ Cycads Source of texts and pictures: • DOBRORUKA, Luděk J. Přírodopis pro 7. ročník základní školy. 1. vyd. Praha: Scientia, 1998, 152 s. ISBN 80-718-3134-4