Lecture 5 - Variation in population size

Question 1

What is Lag phase?

Answer 1

1. Low population
2. Low reproductive rates/getting used to environment
3. Slow growth

Question 2

What is log phase (Exponential Growth)?

Answer 2

1. Plenty of resources
2. Reproductive rate is higher than mortality
3. Rapid increase in population

Question 3

What is carrying capacity (Stationary Phase)?

Answer 3

1. Maximum population size that can be maintained
2. Reproductive and mortality rate is equal
3. Small fluctuations in population size due to environment

Question 4

What is Death or Decline Phase?

Answer 4

1. Mortality rate higher than reproductive rates

Question 5

What are Abiotic factor?

Answer 5

1. Non-living parts of the environment

Question 6

What are the 4 main abiotic factors

Answer 6

1. Temperature (optimum)
2. Light (photosynthesis)
3. pH (enzymes)
4. Water and humidity (transpiration)

Question 7

What are biotic factors?

Answer 7

Living components of an ecosystem and can affect one another

Question 8

What are limiting factors?

Answer 8

1. Natural process affected by a number of factors, limiting factor is the one whose magnitude limits rate of process.