Year 7 Flowering plant reproduction

J.Maden

De Lisle Catholic Science CollegeScience department

Key stage 3

Flowering plant reproduction explorer

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the presentation

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pollination

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fertilisation

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seeds

Plant parts

Terminal bud

Leaf

Lateral bud

Stem

Tap root

Lateral root

Leaf stalk

Ovaries Anthersfemale reproductive parts male reproductive parts

egg cells pollen cells

one egg cell one pollen cell

Embryo Plant

Cell division

Fertilisation (nuclei join)

Seed

Sexual reproductionin plants

Cell division

Cell division

Cell division

Parts of a flowerPetals

Stamens

Carpel

Sepals

Stalk

Female flower parts - carpel

Stigma

Style

Ovary containing egg cells

Male flower parts - stamen

Anther with top cut off

Pollen cells inside pollen sac

Filament

Flower part Job of part

Petals

Stamens(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

Flower A : Anthers fully developed and releasing pollen. Stigma not yet developed

and unable to receive pollen

Ripe anther releasing pollen

onto insect

Unripe stigma

Insect cross pollination 2

Flower B : Anthers withered, no pollen left. Stigma fully developed and now able to receive pollen

Stigma receiving pollen cells from

body of insect

Withered anthers

Wind pollination – grass flowers

Large feathery stigma

Small dull petals

Large droopy stamens

Light powdery pollen cells

Wind pollination – catkins

Anthers

Cluster of male flowers

Stigma of female flower

Flower part Insect pollination

Wind

pollination

Petal size

Petal colour

Scent

Nectary

Stamens

Pollen

Stigma

SmallLarge

Bright Dull

NoYes

Yes No

Upright Droopy

Light/powderySticky/ Spiky

Inside flower Sticks out

Fertilisation of flower egg cells

Egg cell about to be fertilised by pollen

cell nucleus

Ovary

Spiky pollen cell germinating the on

stigma

Pollen tube

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

Radicle first root

First leaves

Plumule first shoot

Seed dispersal - animals

Strawberry

Cleaver

Oak

Seed dispersal wind

Clematis

Dandelion Sycamore

Seed dispersal - self

GeraniumPoppy

Lupin

Year 7Flowering plant reproduction

The end

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