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Angiosperms – vessel seed •Seed plants that produce flowers

Angiosperms – vessel seed •Seed plants that produce flowers • Seeds are enclosed in fruits • Live almost anywhere on earth, even the Arctic and deserts . Flowers Their function --- reproduction.

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Angiosperms – vessel seed •Seed plants that produce flowers

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  1. Angiosperms – vessel seed •Seed plants that produce flowers • Seeds are enclosed in fruits • Live almost anywhere on earth, even the Arctic and deserts

  2. FlowersTheir function --- reproduction. Structure – (note - some may have only male parts, some lack petals.) p.277

  3. Sepals – leaflikestructures that enclose the bud. - protect the developing flower.

  4. Petals – usually the most colorful part. - pollinators are attracted to brightness, patterns – males may see patterns similar to those exhibited by females.

  5. Stamens – male reproductive parts. filament – thin stalk positions anther/pollen for contacting pollinators. anther – produces pollen at top of filament. - pollen contains sperm cells.

  6. Pistils – female reproductive parts. - found in the center of most flowers. - flowers have one pistil. stigma –sticky tip of the pistil that pollen sticks to. style – slender tube connecting stigma to hollow ovary. ovary – protects seeds as they develop. - contains one or more ovules, which contain the eggs.

  7. Pollinators - insects like bees, butterflies, flies - bats, birds Petal shape and brightness, scents attract them. Are all scents pleasant? Rafflesia– pollinated by flies

  8. Reproduction in Angiosperms pollination – occurs when a grain of pollen falls on a stigma. - some occurs by wind. - most rely on pollinators nectar – sugar-rich food deep inside flower. - pollinator enters flower for nectar, brushes against pollen. - pollen is carried to stigma of same flower or another one.

  9. Fertilization - sperm cell from pollen moves down pollen tube. - sperm joins with an egg cell inside an ovule within the ovary. - zygote begins developing into the seed’s embryo. - other parts of the ovule become the rest of the seed.

  10. Fertilization

  11. Fruit development - ovary changes into fruit. Fruit – ripened ovary and other structures that enclose one or more seeds. - animals eating fruits disperse seeds.

  12. Types of angiosperms monocots – one cotyledon - flowers have 3 petals, or multiples of 3. - leaves are long, slender, with parallel veins. - vascular tissue bundles scattered randomly through stem.

  13. Monocots

  14. Monocot examples - grasses, including corn, wheat, rice. - lilies, tulips.

  15. Dicots – two cotyledons - flowers have 4 or 5 petals, or multiples of these. - leaves usually wide, with veins branching many times. - vascular tissue bundles arranged in a ring.

  16. Dicots

  17. Dicot examples- -oak and maple trees, roses and violets. - apples and beans .

  18. Seed plants in use … gymnosperms – conifers provide lumber (pine, Douglas fir) and paper, rayon fibers, etc. angiosperms – food, clothing (cotton), medicine, furniture (cherry, maple, oak).

  19. NOVA video -- flowers http://www.teachersdomain.org/resource/oer08.sci.life.stru.flowers/

  20. So what are we looking at ….?

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