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 calledself-pollination.

• If between different flowers it is calledcross-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

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).

Fertilisation

• The pollen grain grows a tube.• The tube reaches an ovule.• The gamete nuclei fuse (fertilisation)

and a zygote (seed) forms.

Let´s have a look at some pollen tubes underneath the microscope!

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.

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