Ch 30 - Plant Diversity II (1 slide per page)-1

Wind pollinated plants most gymnosperms non flowering

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Unformatted text preview: Wind pollinated plants: • Most gymnosperms (non-flowering seed plants) • Only 10% (25,000) of the angiosperm species are wind-pollinated. • Includes all the cereal plants such as wheat, rice and maize. • Also includes most of the trees found in forests. • Must produce huge quantities of pollen to increase chance of pollination. • 1 anther on a maize flower produces 3000 pollen grains (total = 18 million pollen grains per plant!) • Flowers are usually small and inconspicuous, do not produce nectar or have any scent (since don’t need to attract animal pollinators). 2. Animal pollinated plants: 19 Wind pollinated plants liberate gigantic quantities of pollen allergic rhinitis Pollination 20 2. Animal pollinated plants: Insects Birds Bats 21 Insect pollinated plants: (many angiosperms, few gymnosperms) • Insects are ATTRACTED to flowers by advertising colors and or smells • Insects are REWARDED • Either they eat some of the pollen and/or nectar to make it worth their while • Pollen grains stick to insect on male flower and are transferred to female flower – this is “pollination” Insect pollination is a form of INSECT – PLANT MUTUALISM 23 Bird pollinated plants: (some angiosperms only) Hummingbird pollinated flowers: Lots of nectar – hidden down long structure – deters nectar thieves 24 Bat pollinated flowers (some angiosperms only) Organ-pipe cactus flower and long-nosed bat 26 Pollination vs. Fertilization Pollination: Movement of ♂ gametophyte in pollen grain, to ♀ gametophyte, in the ovule Fertilization: Joining of sperm & egg cells within ovule May occur years after pollination! Angiosperm life cycle 27 Spore vs. Seed Spores Description Seeds A haploid cell made in the sporangium of the sporophyte via meiosis A sporophyte embryo (2n) + nutrients (n) (remnants of ♀ game...
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This note was uploaded on 02/12/2014 for the course BIOLOGY 2011 taught by Professor Woo during the Fall '10 term at University of Central Florida.

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