intro_plants

intro_plants - Introduction to Plants Mrs. M. Rightler...

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Introduction to Plants Mrs. M. Rightler
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Earliest Plants Algae Phytoplankton Lived in the sea
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Problems with life on land Problem Drying Out Making Food Reproduction Getting water & nutrients Solution Waxy cuticle, stomata Formed leaves Develops spores & seeds Roots & vessels
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Types of Plants Avascular Bryophytes nonseed plants Tracheophytes vessels for transport and support
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Mosses & Liverworts: The Bryophytes First land plants AVASCULAR = very small 500 m.y.a. Must grow in moist environments Used for fuel (peat)
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Reproduction in Bryophytes Mosses have a protonema (liverworts do not) Sexual reproduction Antheridium – makes sperm Archaegonium – makes eggs Asexual reproduction Fragmentation Formation of gemmae
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Tracheophytes Vessels XYLEM = transports water & dissolved minerals from roots to leaves PHLOEM = transports sugars from leaves to rest of plant Spores or seeds for reproduction
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Club Mosses (Lycophyta) Leaves produce spores Strobilus = spore-bearing leaves Prothallus = produces antheridia & archaegonia
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Horsetails (Sphenophyta) Jointed stems Reproduction similar to club moss
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intro_plants - Introduction to Plants Mrs. M. Rightler...

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