Flowering plants
Sponsored Links
This presentation is the property of its rightful owner.
1 / 29

Flowering Plants PowerPoint PPT Presentation


  • 49 Views
  • Uploaded on
  • Presentation posted in: General

Flowering Plants. By Neil Bronks. The Parts of a Flower. Most flowers have four parts: sepals, petals, stamens, carpels. The parts of a flower. Sepals protect the bud until it opens. Petals attract insects. Stamens make pollen. Carpels grow into fruits which contain the seeds.

Download Presentation

Flowering Plants

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Flowering Plants

By

Neil Bronks


The Parts of a Flower

  • Most flowers have four parts:

  • sepals,

  • petals,

  • stamens,

  • carpels.


The parts of a flower

  • Sepals protect the bud until it opens.

  • Petals attract insects.

  • Stamens make pollen.

  • Carpels grow into fruits which contain the seeds.


Stamen (male)

  • Anther: pollen grains grow in the anther.

  • When the grains are fully grown, the anther splits open.


Pistil (female)

  • Stigma

  • Style

  • Carpel (ovary)

  • Ovules (eggs)


Parts of a Flowering Plant

Female Parts

Stigma

Style

Ovule

Ovary

Together called the CARPEL

Male Parts

Anther

Filament

Together called the STAMEN


Pollination

  • Flowering plants use the wind, insects, bats, birds and mammals to transfer pollen from the male (stamen) part of the flower to the female (stigma) part of the flower.


Pollination

  • A flower is pollinated when a pollen grain lands on its stigma.

  • Each carpel grows into a fruit which contains the seeds.


Fertilisation

  • Fertilised ovules develop into seeds.

  • The carpel enlarges to form the flesh of the fruit and to protect the ovary.


Pollen

Some of the pollen sticks on the STIGMA

Pollen is produced in the ANTHER

The pollen goes down a small tube to the EGG

There are lots of eggs in most plant ovaries.

The anther explodes and pollen just goes everywhere


Pollen

Sexual reproduction is where two different cells meet

Sex cells are called GAMETES

The female gamete is theEGG

When the pollen and egg meet this is called FERTILISATION

Pollen is the male gamete


Ways to Scatter Pollen

Wind

Insect


Wind Scattered Pollen

Petals

Small and green

No Scent or Nectar

Anthers

Outside

Carry a large amount of very small pollen.

Examples-

Grass

Oak Trees


Wind pollination

  • Some flowers, such as grasses, do not have brightly coloured petals and nectar to attract insects.

  • They do have stamens and carpels.

  • These flowers are pollinated by the wind.


Insect Scattered Pollen

Petals

Colourful

Scented

Contain sweet liquid called

NECTAR

Anthers contain a small amount of large pollen

Example

Roses

Dandelions


Fertilisation

When the male gamete POLLEN

Gets inside the female gamete or EGG

They form aZYGOTE

This is the first cell of a new plant


Zygote

  • The zygote grows to form a baby plant

  • The first cells divide and form an EMBRYO


Zygote

  • The embryo starts to become a root

  • If the flower has lots of ovules it makes lots of seeds (Apples)


Radicle (Root)

Plumule (Stem)

Testa

Food Supply

(OIL and STARCH)

The two together make the EMBRYO

Seed or Fruit Formation


Germination – When?


Zygote forms here

Seeds Germination

Wet and warm conditions

Next the shoot grows up to the light

The first leaves

Embryo becomes primitive root

Lateral roots form


Seed dispersal

Seeds are dispersed in many different ways:

  • Wind

  • Explosion

  • Water

  • Animals

  • Birds


EATEN

STICKY

Thistles

Berries

Seed Dispersal

The carrying of the seed (and its surrounding fruit) as far away from the parent plant as possible

ANIMALS

WIND

Sycamore

Dandelion


Fruit Wall (Pod)

SELF DISPERSAL

WATER DISPERSAL

Pod bursts and flings seeds out

A floating seed is carried by sea or river


How birds and animals help seed dispersal

  • Some seeds are hidden in the ground as a winter store.

  • Some fruits have hooks on them and cling to fur or clothes.


How birds and animals help seed dispersal

  • Birds and animals eat the fruits and excrete the seeds away from the parent plant.


Asexual Reproduction

A plant produces another plant without involving a second plant

No gamete cells are used.

The plant sends out runners


Summary


H/Wp 188-190Q 5,6,9,11,12,15


  • Login