Plant Sex IGCSE Biology

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 or the wind.

Pollination Pollination involves the transfer of_________ (male gamete) from the __________to the _____________(outermost female part) If it is in the____________ flower it is called ___________-pollination. If between_____________ flowers it is called ____________-pollination Plants are pollinated by __________or the _______.

Pollination Pollination

Sexual reproduction in flowers

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). Botanical gardens booklet 2 World of plants –fruits and seeds green

Fertilisation SQA-Describe the growth of a pollen tube and fusion of gametes SQA- Describe fertilisation and fruit formation Botanics fruit formation Tomato- juicy fruit Bean- pod Sycamore- small dry nut Hazelnut- hard outer wall Botanics info Pollen tubes measured were 6, 9, 11 cm long!!

Let´s have a look at some pollen tubes underneath the microscope! The pollen grain grows a tube. The tube reaches an ovule. The gamete nuclei fuse (fertilisation) and a zygote (seed) forms.

Fertilisation

Fertilisation Once fertilisation has taken place the zygote (fertilised ovule)becomes a seed, and the ovary becomes a fruit. The petals die and fall off. The plant seeds are in the fruit. Soft and juicy- tomato, plum and apple Hard and dry- sycamore, dandelion

What are fruits like? The fruits can be: - soft & fleshy - hard & dry Write the names of as many fruit as you can think of as a group and write them on a card Stick them on the correct side of the class Everyone pick a fruit card and your job is to bring that piece of fruit in for next lesson!

To finish off….. http://www.youtube.com/watch?v=sc6snhtpd4g&playnext=1&list=PL2CD6FD59EA58C94A