Plant Reproduction adapted from fa/WebImages/FA_HTMLs/newitje/prepro. ppt

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

2. Structure of a Flower 1. Pistil 2. Stigma 3. Style 4. Ovary 5. Stamen 6. Filament 7. Anther 8. Petal 9. Sepal 10. Receptacle 11. Stem

3. Male Reproductive Structure • The stamen consists of two parts: Anther and Filament • The filament is a stalk that supports the anther

4. Female Reproductive Structure • The 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

5. 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

6. Pollination Animation http://www.orst.edu/extension/mg/botany/images/fertilization1.html

7. Fertilization • After pollen lands on stigma, a pollen tube grows down through the style to ovary

8. Seed and Fruit Development • After fertilization, the petals and sepals fall off flower • Ovary “ripens” into a fruit • The ovule develops into a seed

9. 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

10. Gravity Dispersal - Heavy nuts fall to ground and roll ex. acorns Water Dispersal - Plants near water create floating fruits ex. coconuts