Plant Reproductionadapted from www.fa.org/WebImages/FA_HTMLs/newitje/prepro.ppt

Structure of a Flower1. Pistil 2. Stigma3. Style4. Ovary5. Stamen6. Filament7. Anther8. Petal9. Sepal10. Receptacle11. Stem

Male Reproductive Structure

The stamen consists of two parts: Anther and Filament

The filament is a stalk that supports the anther

Female Reproductive StructureThe pistil consists of

the stigma, style and ovary

The sticky stigma receives the pollen from the anther

The pollen grows a tube down through the style

Pollination

Wind, insects or other animals transfer pollen from the anther of one flower to the stigma of another

Flowers vary depending on pollination mechanism

Pollination Animationhttp://www.orst.edu/extension/mg/botany/images/fertilization1.html

Fertilization

After pollen lands on stigma, a pollen tube grows down through the style to ovary

Seed and Fruit Development After fertilization,

the petals and sepals fall off flower

Ovary “ripens” into a fruit

The ovule develops into a seed

Seed Dispersal Mechanisms-Allow plants to colonize new areas and avoid

shade of parent plant

Wind Dispersal - Flight mechanisms, like parachutes, wings, etc. Ex. Dandelion, maples, birch

Animal Dispersal - Fleshy fruits which animals eat, drop undigested seeds in feces or burrs which stick to animals’ coats

Gravity Dispersal - Heavy nuts fall to ground and rollex. acorns

Water Dispersal - Plantsnear water create floating fruitsex. coconuts