WAEC Agriculture 2025 Paper

Concept:The loss in weight after burning represents the organic matter in the soil.Explanation:Weight of oven-dried soil before burning $= 50 \, g$ Weight of oven-dried soil after burning $= 28 \, g$ The burning removes the organic matter, leaving only the inorganic or mineral portion.Therefore, weight of organic matter is given by:$$\text{Weight of organic matter} = 50 \, g - 28 \, g$$$$\text{Weight of organic matter} = 22 \, g$$Answer:The weight of organic matter in the soil is $22 \, g$.Correct option: A. $22 \, g$