Multiple choice

Which of the following elements has not been proved to be essential for plants?

  1. Nitrogen

  2. Sodium

  3. Zinc

  4. Potassium
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sodium is not generally regarded as an essential nutrient for plants. However, sodium can substitute for potassium to a greater or lesser extent in different plant species.

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