5.3 Populations

Question 1

John label a graph showing a sigmoid population growth curve

Answer 1

Must have

• exponential growth phase
• transitional phase
• plateau phase
• carrying capacity @ asymptote K
• xaxis is time y-axis is numbers

Question 2

Explain the reasons for the exponential growth phase

Answer 2

Plentiful resources, such as food space or light, little or no competition from other habitats, there’ll abiotic factors such as temperature dissolved oxygen levels, little or no presentation disease

Question 3

Explain the reasons for the transitional phase

Answer 3

Increasing competition for resources – so many individuals in a population, predators attract – move into area, Spread of disease – individuals in the space

Question 4

Explain the plateau phase

Answer 4

Habitat space occupied to maximum, smaller number for Hot Springs – supply food, presentation disease increases mortality and growth curve attends a little out, births and immigration = Death and emigration

Question 5

List three factors that set limits to population increase

Answer 5

Predation , disease, availability of resources [water food sunlight shelter]

Question 6

Outline the population size affected by nativity mortality immigration and emigration

Answer 6

Natality – number of new population if height increases, mortality number of deaths it’s high decreases, immigration – remembers arriving at the height increases, emigration members leave it it’s high decreases.