Name the element which is mineral and non-mineral.
Nitrogen is both mineral and non-mineral element.
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Name the elements which are not essential for plants but are essential for animals.
Nitrogen is an essential element for plants and is found in abundance as atmospheric nitrogen. But most plants are unable to use it. Why is it so and in what form do plants utilise nitrogen?
Who developed hydroponics ?
Why is there a need for application of fertilisers ?
