Question:
The element which is not required for normal healthy growth of plants is:
The element which is not required for normal healthy growth of plants is:
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Essential elements are required for plant growth, while toxic heavy metals like lead (Pb) are harmful and not required.
Updated On: Jun 19, 2026
- Nitrogen
- Phosphorus
- Lead
- Potassium
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The Correct Option is C
Solution and Explanation
Step 1: Understand essential elements.
Plants require certain essential elements for normal growth and development.
These elements are classified as macronutrients and micronutrients.
Macronutrients include nitrogen, phosphorus and potassium which are required in large amounts.
Micronutrients include elements like iron, zinc, copper, manganese etc., required in small amounts.
Step 2: Role of given elements.
Nitrogen is essential for amino acids, proteins and nucleic acids.
Phosphorus is essential for ATP, nucleic acids and energy transfer.
Potassium is important for enzyme activation and stomatal regulation.
These are all essential elements required for plant growth.
Step 3: Analyze lead.
Lead (Pb) is a toxic heavy metal.
It is not required for any physiological process in plants.
In fact, it is harmful and inhibits plant growth by affecting enzyme activity and metabolic processes.
Step 4: Final conclusion.
Therefore, the element not required for normal healthy growth of plants is \[ \boxed{\text{Lead}} \]
Plants require certain essential elements for normal growth and development.
These elements are classified as macronutrients and micronutrients.
Macronutrients include nitrogen, phosphorus and potassium which are required in large amounts.
Micronutrients include elements like iron, zinc, copper, manganese etc., required in small amounts.
Step 2: Role of given elements.
Nitrogen is essential for amino acids, proteins and nucleic acids.
Phosphorus is essential for ATP, nucleic acids and energy transfer.
Potassium is important for enzyme activation and stomatal regulation.
These are all essential elements required for plant growth.
Step 3: Analyze lead.
Lead (Pb) is a toxic heavy metal.
It is not required for any physiological process in plants.
In fact, it is harmful and inhibits plant growth by affecting enzyme activity and metabolic processes.
Step 4: Final conclusion.
Therefore, the element not required for normal healthy growth of plants is \[ \boxed{\text{Lead}} \]
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