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:A pupil accidentally "watered" a potted plant with…A small stem from a hibiscus plant was placed in a…Which of the following combinations of farm inputs…Which of the following substances cannot control the…In a water culture experiment, the culture solution…