Which of the following statement is not correct for criteria for essentiality of an element ?

Options

A. The element must be directly involved in the metabolism of plant
B. In absence of the element the plant cannot complete their life cycle
C. The requirement of element must be specific and not replaceable by another element
D. The element must be absolutely necessary for supporting normal growth and not for reproduction

Answer

To determine which statement is not correct regarding the criteria for the essentiality of an element in plants, we can analyze the provided statements step by step.

### Step-by-Step Solution:

1. **Understanding Essential Elements**: Essential elements are those that are necessary for the growth and development of plants. They play crucial roles in various metabolic processes.

2. **Criteria for Essentiality**:
- **Micro or Macro Elements**: The first statement mentions that elements can be micro or macro elements or nutrients. This is correct because essential elements can be categorized based on the quantity required by plants.

- **Involvement in Metabolism**: The second statement states that elements must be directly involved in the metabolism of the plant. This is also correct, as essential elements participate in biochemical reactions necessary for plant life.

- **Life Cycle Completion**: The third statement indicates that in the absence of an element, a plant cannot complete its life cycle. This is true, as essential elements are required for various life processes, including growth and reproduction.

- **Specific Requirement**: The fourth statement claims that the requirement of an element must be specific and not replaceable by other elements. This is accurate because certain elements, like zinc, have specific roles that cannot be substituted by other elements.

- **Growth vs. Reproduction**: The fifth statement asserts that the element must be absolutely necessary for supporting normal growth and not for reproduction. This is the incorrect statement. In reality, essential elements are required for both growth and reproduction, as they are involved in metabolic processes that support all aspects of plant life.

3. **Conclusion**: Based on the analysis, the statement that is not correct is: "The element must be absolutely necessary for supporting normal growth and not for reproduction." This is option number 4.

### Final Answer:
The statement that is not correct regarding the criteria for the essentiality of an element is option number 4.

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