33 angiosperm life cycle endosperm cell ovary egg

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Unformatted text preview: ell Ovary Egg cell 24 2:49 PM BIO1130 Organismal Biology not every conifer will produce zygote not very efficient angiosperm creates solution to this - most no longer rely on wind to move pollen around but animals so insects become major polinators -rather than just casting seeds out on the wind, they are packaged for animals - looking at life cyclemultitude of little spores, dedicating to making casing, inside nucleus building tunnels and another to build zygote pollen produced on anthers. diference occurs in megasporangigum 1 haploid organism and 3 ohers are lost cell has 4 nuclei positionning themselves at opposite ends 3 nuclei inside of megasporangium pollen arrives where cell with germinative nuclei lmfao rewatch htis podcast no waste of ressources in terms of producing seed pollen is moved around Page 8 Mesozoic plants now attracting organisms to move pollen ex: fruit bats great wad of nectar and sugar to feed if polinator specializes on feeding one special plant, red is attractant for amniote pollinators. insects cannot see ther colr red ultraviolet light shows occurence of different colors and sugars for insecst Pollination strategies Figure 25-34 BIO1130 Organismal Biology Université d’Ottawa / University of Ottawa Bee orchid video 25 2:49 PM Insect plant coevolution insects becom specialized for feeding ceratin type of plant plant changes morphology- co-evolution tog ether whole planet makes a shift to flowering plants - plants modify behaviour of polinators but also behaviour for dispersion of seeds ex: some animals will come along to feed on seed lands in different location from plant not wasting energy to priduce seeds n -controlling behaviour of animals - contril behaviour to carry seeds around and disperse them Bees Butterflies BIO1130 Organismal Biology Université d’Ottawa / University of Ottawa 26 2:49 PM Seed dispersal Wind Water Animals BIO1130 Organismal Biology Université d’Ottawa / University of Ottawa Figure 30-20b 27 2:49 PM BIO1130 Organismal Biology Page 9 Mesozoic end of mesozoic and start of cenozoic giant meteorite hits the planet BIO1130 Organismal Biology 28 Université d’Ottawa / University of Ottawa 2:49 PM end cretaceous extinction minerals- shock crystals published in early 60's planet primary productivity went down and dinos went down (this is incorrect) only things that went extinct were dinosaurs groupds that survived mass extictions are small dispersed animals Extinction intensity Mass extinctions Millions of years ago Figure 27-14 BIO1130 Organismal Biology 29 Université d’Ottawa / University of Ottawa 2:49 PM dinosaurs of huge size looking at composition of dinosaur-> so prolific so abundant that they destroyed the planet around them - their whole environemtn ewas in collapse -small change in eveironment- dinos werent able to adapt - primary productivity of planet was destroyed. Cretaceous extinction Iridium Minerals Location 30 2:49 PM BIO1130 Organismal Biology Page 10...
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This note was uploaded on 01/14/2014 for the course BIO 1130 taught by Professor Fenwick during the Fall '08 term at University of Ottawa.

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