Name the nitrifying bacteria in the soil. Why are they called chemoautotrophs ?

Nitrosomonas, nitrobacter are the nitryfying bacteria found in the soil. They are called chemoautotrophs because they get the energy by oxidation of inorganic chemicals for the synthesis of their organic food.
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Which ion is most commonly existing as free ion ?


Potassium ion [K+].
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 What is aeroponics ?

Aeroponics is the process of growing plants with their roots placed in the nutrient-mist without the use of soil or an aggregate medium. The nutrient necessary for the plant growth are sprayed in the form mist on the roots of the plants. 
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What are haustoria ?

Haustoria are the root-like structures of parasitic organisms to derive nutrients from the vascular tissues of the host.
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What does 15–15–15, 17–18–19 etc. signify on fertilizer bags ?

The numbers 15-15-15 and 17-18-19 denote the content of nitrogen, pfosphorous and potassium respectively in the fertilizer. 

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