1. Explain hydroponics and give its importance.

Explanation

Hydroponics is the method of growing plants without soil,using mineral nutrient solutions in water. The containers are made of glass, metal or plastic.They range in size from small pots for individual plants to huge tank for large scale growing.It was demonstrated by a German Botanist Julius Von Sachs in 1980. Hydroponics is successfully employed for the commercial production of seedless cucumber and tomato.Plants are suspended with their roots submerged in water that contain plant nutrients.The roots absorb water and nutrients, but do not perform the anchoring function.Therefore, the plants must be mechanically supported from above.
Importance of hydroponics
(i) Conservation of water and nutrients.
(ii)Controlled plant growth.
(iii) In deserts and Arctic regions hydroponics can be effective alternative method.