The parts of a flower
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The Parts of a Flower PowerPoint PPT Presentation


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The Parts of a Flower. Most flowers have four parts: sepals, petals, stamens, pistils. Parts of a Flower. Sepals protect the bud until it opens. Petals attract insects. Stamens make pollen. Pistils make seeds and grow the fruit to protect them. Stamen (male).

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The Parts of a Flower

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The Parts of a Flower

  • Most flowers have four parts:

  • sepals,

  • petals,

  • stamens,

  • pistils.


Parts of a Flower

  • Sepals protect the bud until it opens.

  • Petals attract insects.

  • Stamens make pollen.

  • Pistils make seeds and grow the fruit to protect them.


Stamen (male)

  • Anther: pollen grains grow in the anther.

  • Pollen contains the male reproductive cells (sperm).

  • The filament is what thin stem-like structure that holds the anther up.


The stamen

(male part)

anther

filament

pollen


Pistil (female)

  • Stigma

  • Style

  • Carpel (ovary)

  • Ovules (eggs)


Pistil (female)

  • Stigma – sticky part of the carpel that traps pollen grains

  • Style – a tube that allows sperm to travel down to fertilize the eggs (ovules)

  • Carpel (ovary) – ovules (eggs) are here waiting to be fertilized and turn into seeds; ovary will grow into a fruit around them to protect them.


The carpel

(female part)

stigma

style

ovary


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.


Fertilization

  • Pollen grains germinate on the stigma, growing down the style to reach an ovule.

  • Fertilized ovules develop into seeds.

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


Seed dispersal

Seeds are dispersed in many different ways:

  • Wind

  • Explosion

  • Water

  • Animals

  • Birds

  • Scatter


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.

  • Some animals eat fruit and excrete seeds in their scat.


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