Lesson Starter What is the name of the

Lesson Starter • What is the name of the Male and female sex cell in plants? • Where is the male/female sex cells produced in plants? • What are the names of the male and female parts of the plant? • What is the job of the sepal? • Why are the petals brightly coloured?

Reproduction in animals and plants Lesson 7

Lesson 7 - Learning intention To dissect the flower and examine the different reproductive structures

Flower Dissection: Method • Take a flower • Carefully use the scalpel to dissect the flower • Use the labelled diagram from last time to help you identify each structure • Stick the parts of the flower into your notes • Use the microscope to look at the pollen grains and draw what you see (on page 15)

Plant sex cells under the microscope Pollen Ovule

Plant reproduction • There are two stages of plant reproduction: Pollination and Fertilisation

Plant reproduction • The pollen grains (MALE SEX CELL) need to move from the anther (MALE) to the stigma (FEMALE) • Pollen transferred to female reproductive organ (stigma)

Pollination • SELF-POLLINATION- the transfer of pollen from anther to stigma on the SAME plant • CROSS-POLLINATION- the transfer of pollen from anther to stigma on DIFFERENT plant

Insect Pollination • Petals are large and bright • Flowers smell nice • Nectar is sweet • Pollen is stick or spikey

Wind Pollination • Petals are small and dull • Flowers are unscented • Pollen is smooth and light

Fertilisation • Fertilisation occurs after the pollen grain lands on the stigma • The pollen grain grows a tube which reaches the ovule- the pollen then travels down the tube and FUSES with the ovule to form a zygote

Fertilisation • The OVARY becomes the FRUIT and OVULES become the SEEDS • PETALS then die and drop off

Homework Page 17 for Thursday 26 th November Describe the journey taken by a pollen grain nucleus from leaving the anther to forming the seed. You can use a diagram.