In Janzen’s experiment, which condition describes his control group?
A.
B.
C.
D.
Correct. See Key Concept 55.4 Positive Interactions Occur When at Least One Species Benefits and None Are Harmed
Incorrect. See Key Concept 55.4 Positive Interactions Occur When at Least One Species Benefits and None Are Harmed
Animation 55.1 Quiz
In Janzen’s experiment, which action was performed on the experimental group?
A.
B.
C.
D.
Correct. See Key Concept 55.4 Positive Interactions Occur When at Least One Species Benefits and None Are Harmed
Incorrect. See Key Concept 55.4 Positive Interactions Occur When at Least One Species Benefits and None Are Harmed
Animation 55.1 Quiz
Suppose that Janzen had found no difference in survival rates of acacia trees in his control and experimental groups. Which of the following conclusions would he have drawn?
A.
B.
C.
D.
Correct. See Key Concept 55.4 Positive Interactions Occur When at Least One Species Benefits and None Are Harmed
Incorrect. See Key Concept 55.4 Positive Interactions Occur When at Least One Species Benefits and None Are Harmed
Animation 55.1 Quiz
Refer to the table below.
Populations of two different species live apart in similar environments. Their population numbers are stable over a three-week period as shown in the table above. A biologist combines the two species at the end of the three-week period and observes their population numbers at weekly intervals thereafter. Which trend might the biologist observe if the two species have a mutualistic relationship?
A.
B.
C.
D.
Correct. See Key Concept 55.4 Positive Interactions Occur When at Least One Species Benefits and None Are Harmed
Incorrect. See Key Concept 55.4 Positive Interactions Occur When at Least One Species Benefits and None Are Harmed