If a crop is planted at a spacing of 100cm x 50cm. Calculate the plant population required for an hectare of farm land.

To calculate the plant population required for one hectare of land, we need to convert the hectare size to square meters. 1 hectare = 10,000 square meters Next, we need to calculate the area occupied by a single plant, given that the crop is planted at a spacing of 100cm x 50cm. Area occupied by a single plant = 100cm x 50cm = 5000 square cm We need to convert this to square meters: 5000 square cm = 0.5 square meters So, the area occupied by a single plant is 0.5 square meters. To calculate the plant population per hectare, we need to divide the total area of the hectare by the area occupied by a single plant: 10,000 square meters ÷ 0.5 square meters = 20,000 plants Therefore, the plant population required for one hectare of land with a spacing of 100cm x 50cm is 20,000. The answer is option D (20,000).