1 / 25

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.

ariane
Download Presentation

Angiosperms – vessel seed •Seed plants that produce flowers

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 ….?

More Related