The charcoal culture experiment is better than the water culture experiment because:

The nutrient solution in flowering culture hydroponics:

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

Carefully observe the following figure.
$(a)$ Name the technique shown in the figure and the scientist who demonstrated this technique for the first time.
$(b)$ Name at least three plants for which this technique can be employed for their commercial production.
$(c)$ What is the significance of the aerating tube and feeding funnel in this setup?

Growing of plants in a nutrient solution on terrace or balcony is called

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