FLOWER ORGANS Biology - 23.2

PLANT ORGANS Some flower organs are responsible for support or function, but others function in a reproductive role.

PLANT ORGANS In general, flowers have four organs: Sepals Petals Stamens Pistils – one or more.

PLANT ORGANS SEPALS Sepals protect the flower bud and can look like small leaves or even resemble the flower’s petals.

PLANT ORGANS PETALS Petals are usually colorful structures that can both attract pollinators and provide them with a landing platform.

PLANT ORGANS Sepals and petals, if present, are attached to a flower stalk, called a peduncle.

PLANT ORGANS Most flowers have several stamens – the male reproductive organs.

PLANT ORGANS Stamens are composed of two parts: 1) Filament-supports the anther 2) Anther-Forms the pollen grains.

PLANT ORGANS The female reproductive part of the flower is the pistil, located in the center of the flower.

PLANT ORGANS The pistil usually has three parts: Stigma – tip of the pistil. This is where pollination occurs. Style – Part that connects the stigma to the ovary Ovary – contains one or more ovules which is where the egg forms.

PLANT ORGANS STRUCTURAL DIFFERENCES Flowers that have sepals, petals, stamens, and one or more pistils are called complete flowers. If one is missing, it is an incomplete flower.

PLANT ORGANS Pollination mechanisms

PLANT ORGANS Pollination mechanisms Animal pollination – insects or other small animals (bats, birds) move from flower to flower searching for nectar. Wind Pollination Self Pollination