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Reproduction in Flowering Plants

What is the function of flowers?

Angiosperm: a plant having its seeds enclosed in an ovary; a flowering plant

The Flower:

{ Is the reproductive unit

of some plants (angiosperms)

Parts include petals, sepals, and or more carpels (the reproductive organs), and stamens (male reproductive organs)

The Flower

The Female Reproductive Organs

Carpel: a simple pistil

Ovary: the enlarged lower part of the pistil in angiosperms, encloses the ovules

Ovules: the female reproductive cells – eggs

The Female Reproductive Organs

Style: a tube on top of the ovary which presents the stigma

Stigma: receives the pollen during fertilization

The Male Reproductive Organs

Stamen: the male reproductive parts of a flower

Consists of Two Parts:Anther: produces pollenFilament: the stalk-like portion of a stamen, supporting the anther

Fertilization- Pollination

Pollen consists of the male reproductive cells which fertilize ovules

Pollen must fertilize an ovule to produce a seed

Bees fly from flower to flower collecting sweet nectar

They spread pollen – depositing on some stigmas

After the male’s pollen grains land on stigma fertilization begins, pollen tubes develop with in the style

The pollen burrows down into the ovary The sperm fertilizes an ovum in the ovule After fertilization the ovule develops into a

seed in the ovary

Fertilization Process