Question

Hydroponics is a technique in which plants are grown in
A. Green house
B. Water saturated sand
C. Balanced nutrient solution
D. Purified distilled water

Answer 1

Hint: With the developed technology, science has advanced solutions for developing plants in a new method. The term hydroponics is one of those. Hydro means water and Phonics means growing. Plants are being grown without the requirement of soil providing or enriching the plants with aqueous solution or nutrient-rich solution.

Complete answer:
Option (A)Greenhouse: Green house term is the term used for protecting plants in a closed chamber and its growth from a pollution free environment. It is nowhere related to hydroponics. Some greenhouse gases- like chlorofluorocarbon, carbon-monoxide.
So, Option (A) is not the correct answer.
Option (B) Water saturated sand: Water saturated sand means sand is getting separated from water. This culture is used to purify water or known as water distillation.
So, Option (B) is not the correct answer.
Option (C) Balanced nutrient solution: Balanced nutrient solution also known as soil-less farming or chemical farming can be termed as hydroponics. Hydroponics is being grown in a metal tank or a small box.
so , Option (C) is the correct answer.
Option (D) Purified distilled water: Purified distilled water is used in lab conditions for conducting experiments.
Option (D) is not the correct answer.

Therefore, Option (C) is the only correct option.
Hydroponics method of cultivation is shown in the below image.
   

Note:
Hydroponics is a new culture method for cultivating crops. It has many benefits like- small space agriculture or compact space farming. It does not require a very big space or much nutrient solution for growth. The nutrients provided are injected in syringes so that plants or crops do not get over nutrients. Crops- such as lettuce, cabbage, flowers can also be grown.