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.
(a) (i) and (ii) only
(b) (i) and (ii) only
(c) (i) , (iii) and (iv) only
(d) (i) , (ii) , (iii) and (iv)

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 evaluate each of the statements provided regarding hydroponics and determine which ones are correct.

### Step-by-Step Solution:

1. **Evaluate Statement (i)**:
- "Hydroponics is the practice of growing plants in nutrient-enriched water, without soil."
- This statement is true. Hydroponics indeed involves growing plants in a soilless environment using nutrient solutions.

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

3. **Evaluate Statement (iii)**:
- "Hydroponics methods require purified water and non-mineral nutrient salts."
- This statement is partially incorrect. While hydroponics does require purified water, it actually requires mineral nutrient salts, not non-mineral nutrient salts. Therefore, this statement is false.

4. **Evaluate Statement (iv)**:
- "The nutrient solutions should not be aerated to obtain optimum growth."
- This statement is incorrect. Proper aeration of nutrient solutions is essential for optimal root growth and health in hydroponics. Thus, this statement is false.

### Conclusion:
From the evaluation:
- Statements (i) and (ii) are correct.
- Statements (iii) and (iv) are incorrect.

Thus, the correct answer is **(a) (i) and (ii) only**.