Biotechnology Bell Ringers for October 19 th , 2010
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Transcript of Biotechnology Bell Ringers for October 19 th , 2010
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Biotechnology Bell Ringersfor October 19th, 2010
1. How many organisms are required for asexual reproduction in plants?
2. What is the difference between rhizomes and runners?
3. What is cell and tissue culture?
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Biotechnology Objectivesfor October 19th, 2010
We will talk about sexual reproduction in plants
We will examine the life cycle of “Fast plants”
Time permitting, we will talk about some current events in Biotechnology
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Sexual Reproduction inFlowering Plants
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What is Sexual Reproduction?
Sexual reproduction in plants is when a new individual is produced by combining materials from two parents
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Sexual Reproduction in Plants In plants, a sperm
moves towards an egg Fertilization occurs when
the egg and sperm nuclei unite to start development of the offspring
By repeated cell division, the fertilized egg grows from a single cell into a many-celled embryo that develops into a seed
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Sexual Reproduction in Plants All living things that
reproduce sexually take some features from each parent
Next year’s flowers will resemble this year’s flowers because they inherit features from both of their parents
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Sexual Reproduction in Plants
The flower is the structure that makes sexual reproduction in flowering plants possible
A wide variety exists in flower appearance, but the function of the flower parts is the same
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The Parts of a Flower
Most flowers have four parts1. Sepals2. Petals3. Stamens4. Carpels
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The Parts of a Flower
The sepal protects the bud until it opens
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Parts of a Flower
The petals attract insects
Some plants have no petals
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Parts of a Flower
The stamen contains the male part of the flower
It produces pollen
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Parts of a Flower
The carpels (ovaries) grow into fruits which contain the seeds
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Stamen (Male) The stamen produces
pollen, a yellow powdery substance
Pollen is produced in the top of the stamen, in a structure called the anther
When the pollen grains are fully grown, the anther splits open
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Pistil (Female) The top of the pistil
is called the stigma When a pollen grain
reaches the pistil, it sticks to the surface of the stigma
The stigma produces sugar that is used by pollen to grow a pollen tube inside the style
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Pistil (Female) The pollen tube inside
the style allows delivery of the sperm down to the ovary
The ovary (carpel) is the enlarged part of the pistil where the female sex cells (eggs) are produced
The eggs (ovules) are fertilized by sperm from the style
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Pollination The transfer of the
pollen from anther to the stigma is called pollination
Flowering plants use the wind, insects, bats, birds, and mammals to transfer pollen
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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
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Seed Dispersal Seeds are dispersed
in many different ways:› Wind› Explosion› Water› Animals› Birds› Scatter
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Wind Dispersal
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Explosion Dispersal
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Water Dispersal
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Animal Dispersal
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Bird Dispersal
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