Biology 107 Reviews

 

 

21. Name the seven stages of a sigmoid growth curve.

sigmoid

1. Lag phase - nothing happens, animals are adapting to their environment

2. Positive growth phase - an interest in reproduce, males find females

3. Log growth phase - an exponential increase in births and few deaths

4. Negative growth phase - the environment is slowly exerted it influence, birth rates decrease and death rates increase.

5. Stationary growth phase - stability in the population, birth rates equal death rates (zero population growth)

6. Death phase - the population has exceeded the environment's ability to support them or the environment has changed for the worse (fire, pollution, etc).

7. Log death phase - the population is in big trouble, on the possible way to extinction