Albert hypothesizes that a certain fungus causes black spot disease in roses. Which of the following experimental designs would support or reject his hypothesis? A.
Pot ten rose bushes of the same breed.
Isolate the rose bushes from each other.
Introduce the fungus into the soil of all the rose bushes.
Observe which, if any, rose bushes develop black spot disease.
B.
Pot ten different species of flower plants, including at least one rose bush.
Isolate the flowers from each other.
Introduce the fungus into the soil of nine of the flowers.
Observe which, if any, flowers develop black spot disease.
C.
Plant a flower garden.
Water the garden deeply.
Introduce the fungus into the soil of the flower garden.
Observe which, if any, plants develop black spot disease.
D.
Pot ten rose bushes of the same breed.
Isolate the rose bushes from each other.
Introduce the fungus into the soil of nine of the rose bushes.
Observe which, if any, rose bushes develop black spot disease.