6.3.2 Populatons and sustainability

Question 1

What can happen to the population of a species?

Answer 1

Remain stable, Rise, Fall or oscillate up and down.

Question 2

What determines the size of a population?

Answer 2

The balance between reproduction and death rate.

Question 3

What is the first part of a population growth graph?

Answer 3

The Lag Phase

Question 4

What happens in the Lag Phase of a population graph?

Answer 4

There are few individuals, who are adjusting to the habitat and conditions. Population growth is slow due to a shortage of breeding individuals.

Question 5

What is the second part of a population growth grapth?

Answer 5

The Log Phase

Question 6

What happens in the Log Phase of a population graph?

Answer 6

Resources are plentiful and conditions are good, leading to a high reproduction rate, exceeding the death rate. Leads to rapid population growth.

Question 7

What happens at the third stage of a population growth graph?

Answer 7

Population growth starts to level off.
Birth rate decreases and death rate increases.

Question 8

What happens at the final stage of a population growth graph?

Answer 8

Carrying capacity is reached. The population size stays stable with only minor fluctuations. Mortality and reproduction rates are the same. The habitat cant support any more individuals.

Question 9

An increase in what will cause a population increase?

Answer 9

Birth Rate and Immigration

Question 10

An increase in what will cause a population decrease?

Answer 10

Death rate and emigration

Question 11

What are limiting factors?

Answer 11

Factors that