Which of the following substances must be present in the soil for growth of a healthy green plant? by Sunday | Nov 23 | 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…The stunted growth of a leguminous plant suffering…Which of the following substances is not usually…A pupil accidentally "watered" a potted plant with…A green snake in green grass is able to escape…