Question:
Which of the following is a criterion for essentiality of an element in plants?
Which of the following is a criterion for essentiality of an element in plants?
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Essential = Irreplaceable + Necessary for life cycle + Direct metabolic role.
Updated On: May 4, 2026
- It must be present in high concentration
- It must be easily available in soil
- The element must be directly involved in metabolism
- It must be required for aesthetic value
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The Correct Option is C
Solution and Explanation
Step 1: Concept
Arnon and Stout proposed specific criteria to determine if a mineral element is truly essential for plant growth and development.
Step 2: Meaning
An essential element is one without which the plant cannot complete its life cycle or produce seeds.
Step 3: Analysis
High concentration (macronutrients) or availability in soil are not strictly criteria for "essentiality"—some essential micronutrients are needed in tiny amounts. The key requirement is that the element's role must be irreplaceable and it must be directly part of an essential metabolic process or structure.
Step 4: Conclusion
Direct involvement in metabolism is one of the three primary pillars of the criteria for essentiality. Final Answer: (C)
Arnon and Stout proposed specific criteria to determine if a mineral element is truly essential for plant growth and development.
Step 2: Meaning
An essential element is one without which the plant cannot complete its life cycle or produce seeds.
Step 3: Analysis
High concentration (macronutrients) or availability in soil are not strictly criteria for "essentiality"—some essential micronutrients are needed in tiny amounts. The key requirement is that the element's role must be irreplaceable and it must be directly part of an essential metabolic process or structure.
Step 4: Conclusion
Direct involvement in metabolism is one of the three primary pillars of the criteria for essentiality. Final Answer: (C)
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