Download conifers

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
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„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
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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
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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
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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
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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
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occurance:
frigeophilic (cold-liking) trees
they grow even on poor soils
they reached its greatest development in
the Mesozoic
CONIFERS
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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