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Distinguish between pollination, fertilization and seed dispersal
- Pollination is the attachment of a pollen grain on the stigma of a flower, by wind or by an animal. After pollination, a pollen grain grows a long pollen tube that stretches down the style to the ovary. The pollen tube enters the ovary through a small opening, the micropyle, and releases sperm to fertilize the eggs.
- Fertilization is the fusion of an egg and sperm to form a zygote. A zygote develops into an embryo, and in flowering plants the embryo is packaged in a seed coat with food reserves.
- Mature seeds typically spread out from their parent plant, a process called seed dispersal. Plants have evolved diverse methods of seed dispersal: some seed pods are explosive, some seeds are attached to sails that blow in the wind, some seeds spin like helicopter blades, and others rely on birds to eat them and spread them in their droppings.
Latest page update: made by boultont
, Feb 18 2010, 12:49 AM EST
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