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Select the incorrect statement about the...

Select the incorrect statement about the essential element :
I. The element may not be necessary for normal growth and reproduction.
II. The requirement of the element must be specific and is replaceable by another element.
III. The element must be directly involved in the metabolism of the plant.
IV. In the absence of the element, the plants do not complete their life cycle.

A

I & II

B

I & IV

C

III & IV

D

I & III

Text Solution

AI Generated Solution

The correct Answer is:
To determine the incorrect statement about essential elements, we need to analyze each statement based on the criteria established by Arnon and Stout in 1939 regarding essential elements for plant growth. ### Step-by-Step Solution: 1. **Understanding Essential Elements**: Essential elements are those that are necessary for the normal growth and reproduction of plants. They play critical roles in various physiological and biochemical processes. 2. **Analyzing Statement I**: - Statement I claims that "The element may not be necessary for normal growth and reproduction." - This contradicts the definition of essential elements, as they are, by definition, necessary for normal growth and reproduction. - **Conclusion**: Statement I is incorrect. 3. **Analyzing Statement II**: - Statement II states, "The requirement of the element must be specific and is replaceable by another element." - Essential elements are specific and cannot be replaced by another element. If an essential element is absent, it cannot be substituted by another element without affecting the plant's growth. - **Conclusion**: Statement II is incorrect. 4. **Analyzing Statement III**: - Statement III asserts, "The element must be directly involved in the metabolism of the plant." - This is true. Essential elements are directly involved in metabolic processes, such as photosynthesis and respiration. - **Conclusion**: Statement III is correct. 5. **Analyzing Statement IV**: - Statement IV claims, "In the absence of the element, the plants do not complete their life cycle." - This is also true. Essential elements are crucial for completing the life cycle of plants, and their absence can lead to failure in growth and reproduction. - **Conclusion**: Statement IV is correct. ### Final Conclusion: Based on the analysis, the incorrect statements are: - Statement I: "The element may not be necessary for normal growth and reproduction." (Incorrect) - Statement II: "The requirement of the element must be specific and is replaceable by another element." (Incorrect) Thus, the answer to the question is that Statements I and II are incorrect.
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