Question

The technique of hydroponics is being employed for the commercial production of vegetables like ___________.
A. Tomato
B. Cucumber
C. Lettuce
D. all of these.

Answer 1

Hint: Hydroponics can be defined as a type of horticulture perhaps a subpart of hydroculture. In this method, plants are grown, usually vegetable crops not in soil. It is done by using a mineral nutrient solution, dissolved in an aqueous medium.

Complete answer: In regions where the soil is poor, infertile and dry, hydroponics is beneficial. For a given crop, hydroponics monitor the optimal pH, manage soil-borne diseases, prevent weeding problems and achieve reliably better yields. Hydroponics has been successfully used to grow vegetables such as strawberries, tomatoes, seedless cucumbers and lettuce as a method for industrial development.
An application of plant nutrition is the preparation of hydroponic solutions, with signs of nutrient deficiency mirroring those seen in conventional soil-based agriculture. In many important aspects, however, the underlying chemistry of hydroponic solutions vary from soil to soil chemistry. To substitute or completely replace inorganic compounds found in traditional hydroponic solutions, organic fertilizers may be used. Using organic fertilizers, however, poses a variety of problems that are not readily tackled. It is often impractical for hobbyists or small-scale commercial growers to combine hydroponic solutions using individual salts when commercial goods are available at fair rates. However, multi-component fertilizers are common even when purchasing commercial goods.
Hence, the correct answer is option D.

Note: Aeroponics is a device in which roots are held constantly or discontinuously in an atmosphere filled with fine drops of nutrient solution (a mist or aerosol). The process needs no substrate and involves growing plants with their roots floating in a deep air or growing chamber with a fine mist of atomized nutrients regularly wetted with the roots. The key benefit of aeroponics is exceptional aeration.