Question

unit 3 test: species & population growth
multiple choice: select the best answer for each question below. do not write on test. use your zip

1. what causes a j - curve to flatten into an s - curve?

a. exponential growth is beginning
b. the death equals the birth rate
c. logistic growth is beginning
d. limiting factors affecting the population

1. over - exploitation of animals is likely to cause

a. speciation
b. species extinction
c. interspecific competition
d. behavioral isolation

1. the graph on the right shows

a. logistic growth
b. exponential growth
c. an s - curve
d. a j - curve
e. both a & c
f. both b & d

1. which letter represents the carrying capacity for this population?

a. a
b. b
c. c
d. d

Explanation:

1. A J - curve flattens into an S - curve due to limiting factors such as resource availability and space constraints that affect population growth.
2. Over - exploitation of animals reduces their numbers severely and can lead to species extinction.
3. The graph shows logistic growth which is represented by an S - curve.
4. The carrying capacity is the maximum population size that an environment can sustain, which is typically the flattened part of an S - curve, represented by the horizontal part of the curve in the graph, which is labeled as D.

Answer:

1. d. limiting factors affecting the population
2. b. species extinction
3. e. both A & C (logistic growth and an S - curve)
4. d. D