why do seeds need to be dispersed away from the parent plant?
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Dispersal of seeds is very important for the survival of plant species. If plants grow too closely together, they have to compete for light, water and nutrients from the soil. ... The longer a seed stays in the air, the farther it can be blown by the wind, helping the plant species widely scatter its offspring.
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Explanation:
Scattering seeds! Learn how some of the most fun seeds of summer travel so well on the breeze. Can you design a seed that scatters well with the wind? Credit: George Retseck
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Key concepts
Biology
Plants
Evolution
Aerodynamics
Introduction
Have you ever looked outside on a windy day and seen "helicopter" seeds spinning through the air? Or picked up a dandelion and blown on it, sending the tiny, fluffy seeds flying all over the place? Wind is very important for dispersing seeds to help plants reproduce. In this project you will design some of your own "seeds" and see which ones work best when they are blown across the room by a fan.
Background
Dispersal of seeds is very important for the survival of plant species. If plants grow too closely together, they have to compete for light, water and nutrients from the soil. Seed dispersal allows plants to spread out from a wide area and avoid competing with one another for the same resources.
Seeds are dispersed in several different ways. In some plants seeds are housed within a fruit (such as apples or oranges). These fruits, including the seeds, are eaten by animals who then disperse the seeds when they defecate. Some fruits can be carried by water, such as a floating coconut. Some seeds have little hooks that can stick on to an animal's furry coat. (You may have gotten them stuck on your clothing if you ever went hiking in the woods or tall grass.)
Other seeds are dispersed by the wind—such as the "winged" seeds from a maple tree that spin and "helicopter" through the air as they fall or the light feathery seeds from a dandelion that can catch on the breeze. The longer a seed stays in the air, the farther it can be blown by the wind, helping the plant species widely scatter its offspring.
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