Hydroponics is

While producing hydroponic plants,which of the following metals is added along with $EDTA$?

$I.$ The practice of growing plants in nutrient-enriched water without soil is called....
$II.$ The system of growing plants with their roots bathed in nutrient mist (a cloud of moisture in air) is called....
Complete the given statements ($I$ and $II$) with the correct pair of options given below.

Hydroponics has been successfully employed as a technique for the commercial production of......

$A$: Jar for nutrient solution culture contains a split cover with holes which hold a bent tube for aeration.
$R$: Regular aeration of culture solution is necessary for proper growth and activities of roots.

Hydroponics is the growth of plants in