Some students investigated the size of a population of dandelion plants in a field. The diagram below shows the field. The students: • placed a 1 m × 1 m square quadrat at 10 random positions in the field • counted the number of dandelion plants in each quadrat. These quadrats contained low numbers of dandelion plants. The students made the hypothesis: ‘Light intensity affects the number of dandelion plants that grow in an area.’ Plan an investigation to test this hypothesis. – 7084

One thought on “Some students investigated the size of a population of dandelion plants in a field. The diagram below shows the field. The students: • placed a 1 m × 1 m square quadrat at 10 random positions in the field • counted the number of dandelion plants in each quadrat. These quadrats contained low numbers of dandelion plants. The students made the hypothesis: ‘Light intensity affects the number of dandelion plants that grow in an area.’ Plan an investigation to test this hypothesis. – 7084”

1. To study how light affects dandelions, quadrats are placed in the study area. A large number of quadrats are used to get good data. The quadrats are placed randomly, using methods like a table of random numbers, a calculator’s random number button, or along a transect line.The quadrats can be put at specific coordinates or at regular intervals along a transect that goes through areas with different light levels.For each quadrat, the number of dandelions is counted and the light intensity is measured. Then, the data from areas with different light intensities are compared to see how light affects the number of dandelions.

   Reply