Name the element which is mineral and non-mineral.

Nitrogen is both mineral and non-mineral element.
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Who developed hydroponics ?

Hydroponics was developed by Julius von Sachs.
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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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Why is there a need for application of fertilisers ?

 Fertilisers are chemical compounds used to replenish minerals in crop fields. Three important elements need to be replenished in crop field as they are used up by repeated cultivation of the land. Fertiliser provide these elements like nitrogen, phophorous and potassium . The NPK fertilisers comprise nitrophoshate with potash in varying proportions. The dosage varies according to the crop, soil, season and other climatic conditions. They increase the nutrient content of the soil. 
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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?

Most plants cannot utilise the atmospheric nitrogen as it is almost inert in nature. Nitrogen combines with oxygen by atmospheric activities and is brought down by rain to the soil. Highly specialised organisms called nitrogen fixers, occur in the soil and they convert nitrogen into nitrates or nitrites or a reduced cationic form like ammonium. These compounds enter the plants as nutrients in the form of dissolved nitrites and nitrates through the root and are assimilated as organic nitrogen.
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