Plant ScienceWeek 5

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

Monocot flowers

Wheat flowers

Wheat flowers are not so attractive, butthere is hope……check out the Easterlily, which is also a monocot flower

FlowersFlowers

Most flowers have four basic Most flowers have four basic components:components: SepalsSepals PetalsPetals StamensStamens PistilPistil

SepalsSepals

The outer most covering of a flower The outer most covering of a flower budbudProtect internal parts of flowerProtect internal parts of flowerFold back when flower opens and helps Fold back when flower opens and helps

support itsupport itIndividual sepals grouped together are Individual sepals grouped together are

known as the known as the calyxcalyx

PetalsPetals

Brightly colored modified leaves found Brightly colored modified leaves found in a circle just inside the in a circle just inside the calyxcalyxAttract insect pollinators because they Attract insect pollinators because they

secrete aromatic liquid, nectarsecrete aromatic liquid, nectarIndividual petals grouped together are Individual petals grouped together are

known as the known as the corollacorolla

StamensStamens

Male reproductive apparatus found just Male reproductive apparatus found just inside of corollainside of corollaConsists of anther and filamentConsists of anther and filament

AntherAnther is a pollen producing structureis a pollen producing structure Pollen, a yellowish powder, contains sperm cellsPollen, a yellowish powder, contains sperm cells

FilamentFilament supports and lifts anthersupports and lifts anther

PistilPistil

The female reproductive organ, The female reproductive organ, consisting of stigma, style and ovary, consisting of stigma, style and ovary, usually in the center of the flower, usually in the center of the flower, surrounded by the stamenssurrounded by the stamensTopped by a sticky structure known as Topped by a sticky structure known as stigmastigma where the pollen landswhere the pollen lands

Bottom of the pistil is a swollen base, Bottom of the pistil is a swollen base, the the ovaryovary, where seeds form from , where seeds form from fertilized ovulesfertilized ovules

Connecting the stigma and ovary is the Connecting the stigma and ovary is the stylestyle

Pollination and FertilizationPollination and Fertilization

PollinationPollination is the transfer of pollen is the transfer of pollen from an anther to a stigma and from an anther to a stigma and fertilizationfertilization is the uniting of a sperm is the uniting of a sperm with an egg.with an egg.

Let’s look at this flower again in Let’s look at this flower again in terms of pollination and fertilizationterms of pollination and fertilization

The pistil is The entire Female Reproductiveapparatus

The stamen is theEntire male Reproductive apparatus

Some Definitions

Flower

Pistil

Anther

Filament

Stamen

Pedicel

Recepticle

Sepal

Stigma

Style

Ovary

Reproductive organ of the plant

Female reproductive structure of a flower composed of one/more carpels

A part of the stamen that produces pollen

The stalk that supports the anther

The filament and anther together

The stalk of an individual flower (in an inflorescence)

The swollen tip of the pedicel where the flower parts are attached

One of the parts of the calyx

The sticky tip of the pistil

A column of tissue that connects the ovary and stigma

The structure that contains ovules

Pollen sac

Pollen

Inflorescence

Peduncle

The part of the anther that produces pollen

The small, light, powdery grains that contain male cells

A group of flowers, in a definite arrangement on an axis

The stalk of an inflorescence, or of an individual flower