Which of the following substances must be present in the soil for growth of a healthy green plant? By: Sunday|Published on: Nov 23|Categories: Biology WAEC| 0 comments A. Amino acids B. Carbon C. Glucose salts D. Magnesium ions Correct Answer: Option D D. Magnesium ions Users Also Read These:Which of the following is a nitrogen-fixing…Which of the following fertilizers should be applied…Which of the following does NOT influence plant growth?The following are methods of measuring plant growth except?Mycorrhizae promote plant growth by?SEE ALSO One of these is used for excretion in earthworm?