Topic 8

Question 1

Population size is influenced by:

Answer 1

1. Birth
2. Death
3. Migration

Question 2

The variable b refers to ___ ______ _____ rate while the variable d refers to ___ ________ ______ rate.

Answer 2

The variable b refers to per capita birth rate while the variable d refers to per capita death rate.

Question 3

The exponential growth model predicts growth under what conditions?

Answer 3

The exponential growth model predicts growth under ideal conditions.

Question 4

r max is always _________ and ________ and varies/does not vary by species.

Answer 4

r max is always positive and constant and varies by species.

Question 5

Larger organisms tend to have slower/larger intrinsic rates of growth.

Answer 5

Larger organisms tend to have slower intrinsic rates of growth.

Question 6

What limits population growth?

Answer 6

1. Food
2. Sunlight
3. Shelter
4. Water
5. Mating partners

Question 7

The rate of population growth tends to increase/decline as abundance increases/decreases.

Answer 7

The rate of population growth tends to decline as abundance increases.

Question 8

Carrying capacity (K) occurs when the rate of _________ and _________ are equal while r = __.

Answer 8

Carrying capacity (K) occurs when the rate of births and deaths are equal while r = 0.

Question 9

What purpose does the logistic model serve?

Answer 9

The logistic model predicts population growth based on changing growth rates as populations reach carrying capacity (K).

Question 10

Crowding: The rate of _______, _____ and ____ are all smaller at higher density.

Answer 10

Crowding: The rate of growth, death and size are all smaller at higher density.

Question 11

Density-dependence: ____-___________ rates of birth and death change as __________ ________ (usually _____ with increasing/decreasing density).

Answer 11

Density-dependence: per-individual rates of birth and death change as population density (usually decline with increasing/decreasing density).