Populations

Question 1

Population

Answer 1

All of the individuals of a species that live together in one place at one time

Question 2

What is Demography

Answer 2

The statistical study of populations. Used to predict how the size of a population will change

Question 3

Why might a small population size likely to go extinct

Answer 3

• natural disaster may kill whole population
• Interbreeding where populations are bred genetically alike -> Recessive traits are likely to occur
• Reduced Variability -> Less chance members of the species will survive changes

Question 4

What are the density dependant and density independent factors (TEST QUESTION)

Question 5

What is population density

Answer 5

The number of organisms in a given area

Distance results in rare encounters, thus little reproduction

Question 6

What is Dispersion and give the three types with examples and diagrams

Answer 6

The way in which individuals are arranged

Random -> Birds

Uniform -> Trees

Clumped -> School of fish, any herd animals

Question 7

Define and Explain why models are used in predicting population growth

Answer 7

A hypothetical

Question 8

Define and Explain why models are used in predicting population growth

Answer 8

A hypothetical population with key charecteristics being studied

Question 9

What are the basic factors that affect the rate of population growth?

Answer 9

Birth rate and death rate affect population growth
rate of growth = birth rate - death rate

Question 10

All populations tend to grow exponentially as long as there are resources available (NA)

Question 11

As populations get larger, it also grows at a faster rate (NA)

This is Maximum population growth under ideal circumstances

Question 12

What is the logistic model and what are it’s assumptions

Answer 12

Assumptions
- Death and Birth rates are not constant
- As the population grows, births decline and death rises
- Eventually birth = death rate is equal so population stops growing

Question 13

What is carrying capacity

Answer 13

The number of organisms of one species that an environment can support indefinitely

Question 14

Describe the two ways a population can prosper

Answer 14

1. Through dependency on the growth rate (r)
2. Through dependancy on carrying capacity (K)

Question 15

Describe the Growth rate strategies

Question 16

Describe the Carrying capacity strategies (K-strategies)