Read the following statements and choose the correct one from the options given below.
(i) Hydroponics is the practice of growing plants in nutrient - enriched water , without soil.
(ii) Hydroponics has been successfully employed as a technique for the commercial production of vegetables such as tomato.
(iii) Hydroponics methods require purified water and non - mineral nutrient salts.
(iv) The nutrient solutions should not be aerated to obtain optimum growth.

Options

A. (i) and (ii) only
B. (i) and (ii) only
C. (i) , (iii) and (iv) only
D. (i) , (ii) , (iii) and (iv)

Answer

To solve the question, we need to analyze each of the four statements provided regarding hydroponics and determine which ones are correct.

### Step-by-Step Solution:

1. **Statement (i)**: "Hydroponics is the practice of growing plants in nutrient-enriched water, without soil."
- **Analysis**: This statement is correct. Hydroponics indeed involves growing plants in a nutrient solution instead of soil.

2. **Statement (ii)**: "Hydroponics has been successfully employed as a technique for the commercial production of vegetables such as tomato."
- **Analysis**: This statement is also correct. Hydroponics is widely used for the commercial production of various vegetables, including tomatoes.

3. **Statement (iii)**: "Hydroponics methods require purified water and non-mineral nutrient salts."
- **Analysis**: This statement is incorrect. Hydroponics requires a nutrient solution that contains essential mineral nutrients, not just non-mineral nutrient salts. Therefore, this statement is false.

4. **Statement (iv)**: "The nutrient solutions should not be aerated to obtain optimum growth."
- **Analysis**: This statement is incorrect. Aeration is crucial in hydroponics to ensure that the roots receive sufficient oxygen for optimal growth. Thus, this statement is also false.

### Conclusion:
- The correct statements are (i) and (ii).
- Therefore, the answer to the question is that statements (i) and (ii) are correct.