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 Seed Dispersal

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Benja Blas

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Join date : 2010-08-05

PostSubject: Re: Seed Dispersal   Thu Oct 28, 2010 5:14 pm

Seeds disperse, getting out of the flower and travel to different places of the world so the flower specie gets to different places. They are many different ways in which this can occur.
-The first one is by wind, some plants are light enough to get carried away and land as far as they can.
-Some other seeds can float over water because they are resistant to water.
-Another seeds can resist digestive juices a animal has, this happens because the animal eats the fruit with the seed included and later excretes the seeds.
-A very strange method is by explosive mechanism, this time the plant burst open throwing seeds everywhere.
-My weird kind of seed dispersal is the shaking method, with this method when wind hits the plant, shaking it, the plant drop little seeds out of the top through little holes.
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Join date : 2010-08-12

PostSubject: Seeds Dispersal   Thu Oct 28, 2010 11:35 pm

One of the important functions of seeds is dispersal; which is a mechanism to establish the seeds in a suitable place away from their parental plants.
Nearly all seeds are produced within fruits. These fruits enable seeds to be dispersed in a variety of ways;
the first one is by wind; some seeds are adapted to catching the wind and being blown away such as sycamore or dandelion.
By an explosive mechanism; these seeds suddenly open throwing the seeds in all directions, such as peas, laburnum or gorse.
By water; some seeds are waterproof and can float. For example, coconuts.
Another good example of seed dispersal is by animals. Lots of fruits are really tasty to animals (and humans), such as blackberries, apples and gooseberries. When an animal eats these fruits the little seeds are not digested and pass through the animal defecation.

Sunflower seeds could be dispersed by wind, they form structures that resemble tiny parachutes. The upper portion of the parachute, called the pappus, resembles hair and is very lightweight. A stem attaches to the pappus, and at the bottom of the stem is the seed of the sunflower. Wind catches the pappus and lifts the seed from the plant and into the air current. Some types of sunflowers do not form pappus structures. These are transported most commonly by birds or animals who disrupt the seed from its position on the plant, intentionally or unintentionally. Seeds also could fall on the ground and can be kicked around by people and wildlife, or transferred when the dirt around the plant is transferred, such as during landscaping.

Sunflower seeds are particularly popular in Mediterranean and Asian countries, like Syria, Israel, Turkey, and Malaysia, and also in countries worldwide like Russia, Ukraine, Bulgaria, Romania, Spain, China, Iran, Canada, and the United States.

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