Sexual Reproduction Flowering Plants

Two Types of Seed Producing Plants 1. Angiosperms 1. Angiosperms Flowering plants Flowering plants 2. Gymnosperm Cone producing plants

Two Types of Flowers 1. Complete 1. Complete Has both male and female structures Has both male and female structures Most flowers are this type Most flowers are this type 2. Incomplete Has either male or female structures Examples: zucchini, pumpkins, squash

Parts of a Flower

Stamen Stamen (#1) Stamen (#1) Male portion of flower Male portion of flower Anther (#2) Anther (#2) Produces pollen Produces pollen Filament (#3) Filament (#3) Holds the anther up Holds the anther up Pollen (#4) Pollen (#4) Male sex cell Male sex cell

Flower Diagram

Pistil Pistil (#5) Pistil (#5) Female portion Female portion Stigma (#6) Stigma (#6) Top sticky portion where pollen attaches Top sticky portion where pollen attaches Style (#7) Style (#7) Middle portion that gives height Middle portion that gives height Ovary (#8) Ovary (#8) Produces ovules (#9) Produces ovules (#9) Ovules (#9) Ovules (#9) Female sex cell Female sex cell

Flower Diagram

Other structures Petals (#10) Petals (#10) Colored portion Colored portion Attracts pollinators Attracts pollinators Protects inner parts Protects inner parts Sepals (#11) Sepals (#11) Usually green Usually green Protects flower in bud stage Protects flower in bud stage

Flower Diagram

Flower Part Video

Two Types of Pollination 1. Self Pollination 1. Self Pollination Pollen from the same flower fertilizes ovules Pollen from the same flower fertilizes ovules Stamen is taller than pistil Stamen is taller than pistil 2. Cross pollination Pollen from another flower fertilizes ovule Stamen is lower than pistil

Process of Pollination 1. Pollen lands on sticky stigma (pistil) 1. Pollen lands on sticky stigma (pistil) 2. A hollow tube (pollen tube) grows down the pistil to the ovary 2. A hollow tube (pollen tube) grows down the pistil to the ovary 3. The nucleus (which contains chromosomes) moves down the pollen tube and combines with the nucleus of the ovule 3. The nucleus (which contains chromosomes) moves down the pollen tube and combines with the nucleus of the ovule 4. Fertilization occurs creating a seed (baby plant 4. Fertilization occurs creating a seed (baby plant

Video of Pollination

Video : Seeds

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

Blow up of an anther caliban.mpiz-koeln.mpg.de/.../ flower.htm

Cut away of an ovary caliban.mpiz-koeln.mpg.de/.../ flower.html

Review of Flower Parts