Which of the following are incorrect as a criterion for the essentiality of an element .
i. If the concerned element is deficient another element can fulfil the need of it
ii. The plants would complete their life cycle irrespective of the absence of deficiency of the elements.
iii. The elements have indirect involvement in the metabolism of plants .
iv.The elements must be absolutely necessary for supporting normal growth and reproduction .

Options

A. i ,ii ,iii ,iv
B. i,ii
C. i, ii, iii
D. ii , iii

Answer

To determine which statements are incorrect as criteria for the essentiality of an element in plants, we need to analyze each statement based on the established criteria for essential elements.

### Step-by-Step Solution:

1. **Understanding Essential Elements**:
- Essential elements are those that are absolutely necessary for the growth and reproduction of plants. Without these elements, a plant cannot complete its life cycle.

2. **Evaluating Statement i**:
- **Statement**: "If the concerned element is deficient, another element can fulfill the need of it."
- **Analysis**: This statement is incorrect. An essential element cannot be replaced by another element; it is specific and irreplaceable for the plant's needs.

3. **Evaluating Statement ii**:
- **Statement**: "The plants would complete their life cycle irrespective of the absence of deficiency of the elements."
- **Analysis**: This statement is also incorrect. Essential elements are crucial for completing the life cycle of plants. If an essential element is absent, the plant cannot complete its life cycle.

4. **Evaluating Statement iii**:
- **Statement**: "The elements have indirect involvement in the metabolism of plants."
- **Analysis**: This statement is incorrect as well. Essential elements are directly involved in the metabolism of plants, not indirectly.

5. **Evaluating Statement iv**:
- **Statement**: "The elements must be absolutely necessary for supporting normal growth and reproduction."
- **Analysis**: This statement is correct. Essential elements are indeed necessary for normal growth and reproduction.

### Conclusion:
Based on the analysis:
- Statements i, ii, and iii are incorrect as criteria for the essentiality of an element.
- Statement iv is correct.

Thus, the incorrect statements are **i, ii, and iii**.