LEFT CLICK OR PRESS SPACE BAR TO ADVANCE, PRESS P BUTTON TO GO BACK, PRESS ESC BUTTON TO END LEFT CLICK OR PRESS SPACE BAR TO ADVANCE, PRESS P BUTTON TO GO BACK, PRESS ESC BUTTON TO END COMPUTER PRESENTATIONS FOR KS3 SCIENCE - BIOLOGY ©2003, STEVE PARKER COMPUTER PRESENTATIONS FOR KS3 SCIENCE - BIOLOGY ©2003, STEVE PARKER

1 1 KS3 SCIENCE - BIOLOGY KS3 SCIENCE - BIOLOGY Plant Reproduction Plant Reproduction

FLOWERS 2 2

3 3 The Flower contains a plant’s male and female reproductive organs The Flower contains a plant’s male and female reproductive organs Stigma Anther Style Petals Filament

FLOWERS 4 4 The female part of the flower is the Carpel, consisting of the Stigma at the end of the Style The female part of the flower is the Carpel, consisting of the Stigma at the end of the Style The female sex cells are Ovules inside Ovaries at the bottom of the Style The female sex cells are Ovules inside Ovaries at the bottom of the Style

FLOWERS 5 5 The male parts of the flower are the Stamens, which are made up of Anthers at the end of Filaments The male parts of the flower are the Stamens, which are made up of Anthers at the end of Filaments The male sex cells are Pollen grains on the Anthers The male sex cells are Pollen grains on the Anthers

FLOWERS 6 6 The brightly coloured parts of the flower are the Petals, which are designed to attract insects The brightly coloured parts of the flower are the Petals, which are designed to attract insects

POLLINATION 7 7

8 8 If pollen moves from the anther to the stigma of the same flower, or another flower on the same plant, this is called Self-Pollination If pollen moves from the anther to the stigma of the same flower, or another flower on the same plant, this is called Self-Pollination

POLLINATION 9 9 If pollen transfers from the anther of one plant to the stigma of another plant, this is called Cross-Pollination If pollen transfers from the anther of one plant to the stigma of another plant, this is called Cross-Pollination

POLLINATION 10 There are two ways in which pollen can be moved from anther to stigma There are two ways in which pollen can be moved from anther to stigma

POLLINATION 11 One way is by using brightly coloured petals, nectar production and sweet scent to attract insects, which rub against the anther and then the stigma One way is by using brightly coloured petals, nectar production and sweet scent to attract insects, which rub against the anther and then the stigma

POLLINATION 12 Another way is to rely on the wind, in which case the anthers stick out of a dull flower and make far more pollen, while the stigma may be feathery Another way is to rely on the wind, in which case the anthers stick out of a dull flower and make far more pollen, while the stigma may be feathery

FERTILISATION 13

FERTILISATION 14 Stigmas are usually sticky, to catch any passing pollen grains Stigmas are usually sticky, to catch any passing pollen grains

FERTILISATION 15 The pollen grain grows a pollen tube down to the ovule The pollen grain grows a pollen tube down to the ovule

FERTILISATION 16 The fertilised ovule then turns into a Seed, which is an embryo plant The fertilised ovule then turns into a Seed, which is an embryo plant Hard Seed Coat Embryo Shoot Embryo Root Food Store

DISPERSAL OF SEEDS 17

DISPERSAL OF SEEDS 18 Seeds must be dispersed, or the new plant will be growing on top of the old, and one way is by wind Seeds must be dispersed, or the new plant will be growing on top of the old, and one way is by wind Parachute Type Wing type

DISPERSAL OF SEEDS 19 Another method is to have seeds inside tasty Fruit, so that animals will eat the fruit and the seeds will come out in their droppings Another method is to have seeds inside tasty Fruit, so that animals will eat the fruit and the seeds will come out in their droppings

DISPERSAL OF SEEDS 20 Seeds may also be in Pods which dry out and burst, flicking the seeds away Seeds may also be in Pods which dry out and burst, flicking the seeds away

DISPERSAL OF SEEDS 21 Seeds will settle, often remaining dormant for long periods, and once there is enough moisture and warmth they begin to Germinate Seeds will settle, often remaining dormant for long periods, and once there is enough moisture and warmth they begin to Germinate