1. Plant Science
Week 5

3. Flowers are found in many kinds of shapes, colors and petal display

7. Monocot flowers Wheat flowers Wheat flowers are not so attractive, but
there is hope……
check out the Easter
lily, which is also a
monocot flower

8. Flowers Most flowers have four basic components: Sepals Petals Stamens
Pistil

9. Sepals The outer most covering of a flower bud
Protect internal parts of flower
Fold back when flower opens and helps support it
Individual sepals grouped together are known as the calyx

10. Petals
Brightly colored modified leaves found in a circle just inside the calyx
Attract insect pollinators because they secrete aromatic liquid, nectar
Individual petals grouped together are known as the corolla

12. Stamens Male reproductive apparatus found just inside of corolla
Consists of anther and filament
Anther is a pollen producing structure
Pollen, a yellowish powder, contains sperm cells
Filament supports and lifts anther

13. Pistil
The female reproductive organ, consisting of stigma, style and ovary, usually in the center of the flower, surrounded by the stamens
Topped by a sticky structure known as stigma where the pollen lands
Bottom of the pistil is a swollen base, the ovary, where seeds form from fertilized ovules
Connecting the stigma and ovary is the style

14. Pollination and Fertilization
Pollination is the transfer of pollen from an anther to a stigma and fertilization is the uniting of a sperm with an egg.

15. Let’s look at this flower again in terms of pollination and fertilization
The pistil is
The entire
Female
Reproductive
apparatus
The stamen is the
Entire male
Reproductive
apparatus

17. Some Definitions Flower Reproductive organ of the plant
Female reproductive structure of a flower composed
of one/more carpels
Pistil
Anther
A part of the stamen that produces pollen
Filament
The stalk that supports the anther
Stamen
The filament and anther together
Pedicel
The stalk of an individual flower (in an inflorescence)
Recepticle
The swollen tip of the pedicel where the flower parts
are attached
Sepal
One of the parts of the calyx
Stigma
The sticky tip of the pistil
Style
A column of tissue that connects the ovary and stigma
Ovary
The structure that contains ovules

18. The part of the anther that produces pollen
Pollen sac
The part of the anther that produces pollen
Pollen
The small, light, powdery grains that contain male cells
Inflorescence
A group of flowers, in a definite
arrangement on an axis
Peduncle
The stalk of an inflorescence, or of an individual flower