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Angiosperms – vessel seed

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Presentation on theme: "Angiosperms – vessel seed"— 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 Flowers Their function --- reproduction.
Structure – (note - some may have only male parts, some lack petals.) p.277

3 Sepals – leaflike structures 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
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
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.

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

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11 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.

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13 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.

14 Fertilization

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

16 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.

17 Monocots

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

19 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.

20 Dicots

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

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23 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).

24 NOVA video -- flowers

25 So what are we looking at ….?


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