Name the elements which are not essential for plants but are essential for animals.
Sodium and Iodine are essential for animals but not for plants.
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Who developed hydroponics ?
Name the element which is mineral and non-mineral.
Why is there a need for application of fertilisers ?
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?
