why roots are at bottom of the plant

it's very simple , roots are at the bottom of the plant to absorb water and nutrients from the soil . and it help to stand straight .

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because therejob is to absorb water and nutrients and supply in the plant. they are also there to hold plants
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Because they absorb water from soil
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Roots are an important part of plant and are always at the bottom because their function is to absorb water and minerals from soil and hold the plant in the soil firmly to provide anchorage to the plant. But in nature there are roots such as prop roots in banyan tree which arise from the branches still they grow towards ground and sometimes inside the soil. This is because of the geotropism of plants which says that root system always grows in direction of gravitational force or soil and shoot system grows towards the opposite of gravitational force.
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