Multiple choice

Na, Si, Co and Se are

  1. Beneficial elements

  2. Required by higher plants

  3. These are in addition to essential elements

  4. All
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sodium, Silicon, Cobalt, and Selenium are considered beneficial elements for certain plants, meaning they are not strictly essential but promote growth or provide advantages. Since they are additional to the 17 essential elements, all the provided descriptions are accurate.

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