Sexual Sexual ReproductionReproduction

Flowering PlantsFlowering Plants

Two Types of Seed Two Types of Seed Producing PlantsProducing Plants

1. Angiosperms1. Angiosperms Flowering plantsFlowering plants

2. Gymnosperm2. Gymnosperm Cone producing Cone producing

plantsplants

Two Types of FlowersTwo Types of Flowers

1. Complete1. Complete Has Has bothboth male male

andand female female structuresstructures

Most flowers are Most flowers are this typethis type

2. Incomplete2. Incomplete Has Has eithereither male male oror

female structuresfemale structures Examples: Examples:

zucchini, zucchini, pumpkins, squashpumpkins, squash

Parts of a FlowerParts of a Flower

StamenStamen

Stamen (#1)Stamen (#1) Male portion of flowerMale portion of flower Anther (#2)Anther (#2)

Produces pollenProduces pollen Filament (#3)Filament (#3)

Holds the anther upHolds the anther up Pollen (#4)Pollen (#4)

Male sex cellMale sex cell

Flower DiagramFlower Diagram

PistilPistil

Pistil (#5)Pistil (#5) Female portionFemale portion Stigma (#6)Stigma (#6)

Top sticky portion where pollen attachesTop sticky portion where pollen attaches Style (#7)Style (#7)

Middle portion that gives heightMiddle portion that gives height Ovary (#8)Ovary (#8)

Produces ovules (#9)Produces ovules (#9) Ovules (#9)Ovules (#9)

Female sex cellFemale sex cell

Flower DiagramFlower Diagram

Other structuresOther structures

Petals (#10)Petals (#10) Colored portionColored portion Attracts pollinatorsAttracts pollinators Protects inner partsProtects inner parts

Sepals (#11)Sepals (#11) Usually greenUsually green Protects flower in bud stageProtects flower in bud stage

Flower DiagramFlower Diagram

Flower Part VideoFlower Part Video

Two Types of PollinationTwo Types of Pollination

1. Self Pollination1. Self Pollination Pollen from the Pollen from the

same flower same flower fertilizes ovulesfertilizes ovules

Stamen is taller Stamen is taller than pistilthan pistil

2. Cross 2. Cross pollinationpollination Pollen from Pollen from

another flower another flower fertilizes ovulefertilizes ovule

Stamen is lower Stamen is lower than pistilthan pistil

Process of PollinationProcess of Pollination

1. Pollen lands on sticky stigma (pistil)1. Pollen lands on sticky stigma (pistil) 2. A hollow tube (pollen tube) grows 2. A hollow tube (pollen tube) grows

down the pistil to the ovarydown the pistil to the ovary 3. The nucleus (which contains 3. The nucleus (which contains

chromosomes) moves down the pollen chromosomes) moves down the pollen tube and combines with the nucleus of tube and combines with the nucleus of the ovulethe ovule

4. Fertilization occurs creating a seed 4. Fertilization occurs creating a seed (baby plant(baby plant

Video of PollinationVideo of Pollination

Video : SeedsVideo : Seeds

Snapdragon FlowerSnapdragon Flower

caliban.mpiz-koeln.mpg.de/.../ flower.html

Blow up of an antherBlow up of an anther

caliban.mpiz-koeln.mpg.de/.../ flower.htm

Cut away of an ovaryCut away of an ovary

caliban.mpiz-koeln.mpg.de/.../ flower.html

Review of Flower PartsReview of Flower Parts