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Because they need water.Water is necessary for living of tress/plants/shrubs.The need water to carry out the process of photosynthesis  .They will need water because they high quantity of water in soil causes seed coat to swell and allows the cells
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We can prove it by an experiment:

. Take two petridishes and mark them as A and B.
.Spread cotton wool in both the petridishes.
.Moisten the cotton wool in petridish A with water.
.Place equal number of gram seeds in both the petridishes.
.Keep both the petridishes in a room temperature (25 degrees to 30 degrees).
.observe after two days.

You will observe that seeds in petridish A germinate whereas seeds in petridish B do not germinate.
This shows that water is essensial for germination.

Now, we can say that a plant requires wet soil to germinate.A seed requires adequate amount of water to germinate. In wet soil, adequate absorbtion of water is done.The moisture in the wet soil softens the seed coay and the testa.Seed swells up and embryo breaks through the softned seed-coat and comes out easily.Therefore, it requires wet soil to germinate.

hope it helps.. :)))

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Why do they delete all the comments???
leave it ^_^
go to http://brainly.in/question/130474 and plz answer it
Actually seeds require moisture and not soil to germinate A seed completely insidewet soil will not germinate.The seedling won't survive without water and sunlight, it needs to time its emergence perfectly. Seeds need water and heat. Too cold or too hot and they won't germinate, which makes sense - if conditions aren't right for the seedling to grow, it's going to wait until things get better.
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Water is life, especially for seeds. Water activates the germination cycle of the seed by causing the seed coat/hull to swell which in turn hydrates the cell of the seed. Once hydrated, the hull is softened and will then allow the cell to expand and then break through the protective outer layer of the seed. This then is the initiation of the growth process.
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