Why is purification of water and nutrient salts so important in studies involving mineral nutrition using hydroponics?

Why is it easier for you to float in salt water than in fresh water?

Why water is used as coolant in automobile radiator ?

In rooted plants, transport I xylem (of water and minerals) is essentially (A)____ from roots to the stems. Organic and mineral nutrients however under (B)____ transport.

Why are flocs important in biological treatment of waste water ?

Why is the use of iodised salt advisable ?

Choose the correct option mycorrhiza is a symbiotic association of fungus with root system which helps in (a) absorption of water, (b) mineral nutrition ,(c) translocation ,(d) gaseous exchange