Flowering Plant Sex

1. Flowering Plant Sex

2. Carpel female parts Stigma Petals Stamen male parts Style Anther Ovary Filament Ovules Nectaries Sepals Label your diagram on your worksheet

3. What do the parts do? Sepals- protect the flower when it is a bud Stamen- anther produces male sex cells (pollen) Carpel- stigma traps pollen Style is where pollen tube grows down to female sex cells. Petals- colourful to attract the insects Nectaries- give out sugary liquid to attract insects Add these notes into your table on your worksheet Carpel- ovary produces female sex cells (ovules)

4. Pollination • Pollination involves the transfer of pollen (male gamete) from the anther to the stigma (outermost female part) • If it is in the same flower it is called self-pollination. • If between different flowers it is called cross-pollination • Plants are pollinated by insects,wind, birds or animals

5. Pollination Pollination

6. Sexual reproduction in flowers Sexual reproduction in flowers

7. Fertilisation • Fertilisation involves the fusion of the nucleus of the male gamete (in the pollen) with the nucleus of the female gamete (in the ovules).

8. Fertilisation

9. Let´shave a look at somepollentubesunderneaththemicroscope! • The pollen grain grows a tube. • The tube reaches an ovule. • The gamete nuclei fuse (fertilisation) and a zygote (seed) forms.

10. Fertilisation

11. Fertilisation Once fertilisation has taken place the zygote (fertilisedovule)becomes a seed, and the ovary becomes a fruit. The petals die and fall off. The plant seeds are in the fruit.

12. FruitFormation and SeedDispersal

13. Seed Dispersal- why? • Seeds must be carried away (dispersed / scattered) from the parent plant to: • Reduce overcrowding • Reduce competition for: • - Water • - Light • - Nutrients

14. Learning about Seed Dispersal Use the next few slides, the Blog link and the video clip to help you fill in the rest of your worksheet relating to seed dispersal

17. A wee introduction to seed dispersal!