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Group Four Seeded, vascular plants (ex: a ngiosperm)

Group Four Seeded, vascular plants (ex: a ngiosperm). stamen. filament. anther. stigma. style. carpel. ovary. sepal. petal. Quick REVIEW: Flowers C ontain R eproductive O rgans P rotected By Specialized L eaves. Sepals and petals are modified leaves.

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Group Four Seeded, vascular plants (ex: a ngiosperm)

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  1. Group FourSeeded, vascular plants (ex: angiosperm)

  2. stamen filament anther stigma style carpel ovary sepal petal Quick REVIEW: Flowers Contain Reproductive Organs Protected By Specialized Leaves • Sepals and petals are modified leaves. • Sepals are outermost layer that protectsdeveloping flower • Petals can help to attract animal pollinators • A stamen is the male structure of the flower • Anther produces pollen grains • Filament supports the anther • The innermost layer of a flower is the female carpel. • Stigma is sticky tip • Style is tube leading from stigma to ovary • Ovary produces female gametophyte

  3. Flowering plants can be pollinated by wind or animals • Wind pollinated flowers have small flowers and large amounts of pollen. • Animal pollinated flowers have larger flowers and less pollen. Many flowering plants are pollinated by animal pollinators. • Pollination occurs as animal feeds from flower to flower • Animal pollination more efficient than wind pollination

  4. Fertilization Takes Place Within The Flower Cell that will divide & become the pollen tube • Male gametophytes (pollen grains) are produced in the anthers. • Male spores produced inanthers by meiosis • Each spore divides bymitosis to form twohaploid cells • Two cells form asingle pollen grain Cell that will divide & become 2 sperm Pollen grain Stamen Anther Filament

  5. One Female Gametophyte Can Form In Each Ovule of AFlower’s ovary • Many cells can be made in the ovule • One cell becomes the egg • One cell becomes 2 polar nuclei • The rest die Ovule (Egg) [ 2 Polar Nuclei (Each = 1n)

  6. Angiosperm Life Cycle 1. Pollen sticks to animal or is released into wind.

  7. 1. Pollen sticks to animal or is released into wind.

  8. 2. Animal finds new flower to feed on & pollen grains land on the stigma (pollination) 3. Pollen tube grows towards the egg and 2 nuclei transfer down into the ovule .. Let’s zoom in egg

  9. 4. Angiospermsgo through the process of double fertilization. • 1 sperm fuse with the egg = zygote • 1 sperm fuse with the polar nuclei = triploid (3n) endosperm Double Fertilization Endosperm (3n) Zygote

  10. Endosperm Seed Coat Embryo • Endosperm provides food supply for embryo 5. Each ovule becomes a seed. 6. The surrounding ovary grows into a fruit.

  11. 7. Flower dries up and fruit falls to ground.

  12. 8. Animals eat fruit….seeds come out the other end…

  13. 9. Seeds get dispersed. 10. Seed germinates (sporophyte), and the cycle starts over. Ground

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