Which of the following substances does a plant obtain from the air?

• A. Magnesium
• B. Nitrogen
• C. Water
• D. All of the listed responses are correct.
• E. Carbon

Answer: (E)

Verified step by step guidance

1. Identify the substances listed in the problem: Magnesium, Nitrogen, Water, and Carbon.
2. Understand that plants obtain certain essential elements from the air, primarily through the process of photosynthesis.
3. Recall that during photosynthesis, plants take in carbon dioxide (CO₂) from the air.
4. Recognize that magnesium and nitrogen are typically absorbed from the soil, not the air. Water is absorbed through the roots from the soil.
5. Conclude that the substance a plant obtains from the air is carbon, in the form of carbon dioxide.