BIOL211#6and#7(1)

BIOL211#6and#7(1) - Chapter 30 Gymnosperms and Angiosperms...

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1 Chapter 30 Gymnosperms and Angiosperms Figure 30.1 Modern Gymnosperms Produce seeds that are exposed rather than enclosed in fruits Most are woody plants that occur as shrubs or trees Include the giant sequoias Giant sequoias – Sierra Nevada – 6,000 tons – 100 meters tall The large size of trees is based on the presences of wood – Pipelike arrays of empty, water-conducting cells – Strengthened by lignin – Produced by vascular cambium – First appeared in progymnosperms A progymnosperm ( Archaeopteris ) Figure 30.2
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2 Gymnosperm evolution – Early gymnosperms lived in Carboniferous ecosystems – The Permian was marked by a warmer and drier climate that favored gymnosperms – Gymnosperms dominated terrestrial ecosystems throughout the Mesozoic era Gymnosperm evolution – Only a few phyla have survived to modern times Cycadophyta – 300 species – “Dino food” Cycadophyta – Have coralloid roots – Many produce toxins – Pollinated by beetles Figure 30.4 Ginkgophyta – One species Ginkgo biloba Maidenhair tree – Resistant to air pollution – Fleshy seed coat smells rancid Coniferophyta – Largest group – Named for their seed cones – Most are evergreens White Pine Balsam Fir Yew Wollemia Pine
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3 Coniferophyta – Produce pollen cones and ovule-bearing cones Pollen Cones Ovule Cones Pinus Life Cycle Figure 30.7
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BIOL211#6and#7(1) - Chapter 30 Gymnosperms and Angiosperms...

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