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Published byMartina Kelly Modified over 9 years ago
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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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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 in plants is when a new individual is produced by combining materials from two parents
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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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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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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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Most flowers have four parts 1. Sepals 2. Petals 3. Stamens 4. Carpels
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The sepal protects the bud until it opens
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The petals attract insects Some plants have no petals
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The stamen contains the male part of the flower It produces pollen
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The carpels (ovaries) grow into fruits which contain the seeds
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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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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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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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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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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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Seeds are dispersed in many different ways: › Wind › Explosion › Water › Animals › Birds › Scatter
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