Year 7 Flowering plant reproduction J.Maden De Lisle Catholic Science College Science department Key stage 3 Year 7 Flowering plant reproduction J.Maden

Flowering plant reproduction explorer Click here to see all of the presentation Click here to go directly to plant pollination Click here to go directly to fertilisation Click here to go directly to seeds

Plant parts Terminal bud Leaf Leaf stalk Lateral bud Stem Lateral root Tap root

Sexual reproduction in plants Ovaries Anthers female reproductive parts male reproductive parts egg cells pollen cells Fertilisation (nuclei join) one egg cell one pollen cell Cell division Cell division Cell division Cell division Embryo Seed Plant

Parts of a flower Petals Stamens Carpel Sepals Stalk

Female flower parts - carpel Stigma Style Ovary containing egg cells

Male flower parts - stamen Pollen cells inside pollen sac Anther with top cut off Filament

Flower part Job of part Petals Stamens Attract insects Pollen cell (filament & anther) Pollen cell Carpel (stigma, style & ovary) Ovule (egg cell) Attract insects Produce pollen cells Fertilise the egg cells Produce egg cells Forms a seed when fertilised by pollen

Pollen cells Sticky pollen Spiky pollen Air sac on pollen cell

Insect cross pollination 1 Unripe stigma Ripe anther releasing pollen onto insect Flower A : Anthers fully developed and releasing pollen. Stigma not yet developed and unable to receive pollen

Insect cross pollination 2 Stigma receiving pollen cells from body of insect Withered anthers Flower B : Anthers withered, no pollen left. Stigma fully developed and now able to receive pollen

Wind pollination – grass flowers Large feathery stigma Small dull petals Large droopy stamens Light powdery pollen cells

Wind pollination – catkins Anthers Stigma of female flower Cluster of male flowers

Large Small Bright Dull No Yes Yes No Upright Droopy Sticky/ Spiky Flower part Insect pollination Wind pollination Petal size Petal colour Scent Nectary Stamens Pollen Stigma Large Small Bright Dull No Yes Yes No Upright Droopy Sticky/ Spiky Light/powdery Inside flower Sticks out

Fertilisation of flower egg cells Spiky pollen cell germinating the on stigma Pollen tube Egg cell about to be fertilised by pollen cell nucleus Ovary

Fruit formation Fertilised flower Petals, stamens, and stigma wither Seeds develop inside the swelling ovary

Seed structure Testa seed coat Cotyledons food store Embryo

Seed germination First leaves Radicle first root Plumule first shoot

Seed dispersal - animals Oak Strawberry Cleaver

Seed dispersal wind Clematis Dandelion Sycamore

Seed dispersal - self Poppy Geranium Lupin

Year 7 Flowering plant reproduction The end Click here to view again