(a) How are living organisms dependent on soil ? (b) Are organisms that live in water totally independent of soil as a resource?

Ans. (a) Soil is an important resource that decides the diversity of life in an area.

• The topsoil (the outermost layer of soil) is rich in minerals. It is this layer that supplies nutrients to life forms.

• It hosts a number of organisms that help in recyling of nutrients.

• It sustains the vegetation covers that in turn sustain the lives of thousands of animals life-forms.

(b) Organisms that live in water are not totally independent of soil as a resource. The `minerals and nutrients that they require to sustain their life come from soil, dissolved in the rainwater.

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