Multiple choice

Carbon is available to crop plants in the form of

  1. carbonates

  2. carbon dioxide

  3. elemental carbon

  4. amino acids

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Plants obtain carbon primarily from atmospheric carbon dioxide (CO2) during photosynthesis. This carbon is fixed into organic molecules like glucose, which serve as the building blocks for the plant's structure and energy.