Which of the following is NOT one of the nine macronutrients?

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Study for the Grade 9 Environmental Chemistry Test. Use a blend of multiple-choice questions and detailed explanations. Master key concepts and prepare effectively!

Multiple Choice

Which of the following is NOT one of the nine macronutrients?

Explanation:
Macronutrients are nutrients that plants need in large amounts to build body, support growth, and power metabolism, while micronutrients are needed only in trace amounts. Among the options, carbon and hydrogen are foundational building blocks of organic matter, and potassium supports enzyme activity and osmotic balance in plants—these are classic macronutrients. Iron, on the other hand, is essential but required in much smaller quantities, making it a micronutrient. So iron is not a macronutrient, even though it’s crucial for processes like electron transport and chlorophyll function.

Macronutrients are nutrients that plants need in large amounts to build body, support growth, and power metabolism, while micronutrients are needed only in trace amounts. Among the options, carbon and hydrogen are foundational building blocks of organic matter, and potassium supports enzyme activity and osmotic balance in plants—these are classic macronutrients. Iron, on the other hand, is essential but required in much smaller quantities, making it a micronutrient. So iron is not a macronutrient, even though it’s crucial for processes like electron transport and chlorophyll function.

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