Biology chapter 5 term 3

Question 1

A change in temperature range, humidity level, annual rainfall, or sunlight might make a new geographic area uninhabitable for the species.

Answer 1

Abiotic conditions

Question 2

predators, competitors, and parasites, present threats that might make the new location difficult for survival

Answer 2

biotic conditions

Question 3

…..are biotic or abiotic factors that keep a population from continuing to increase indefinitely, in other words, if the food supply increases a larger population might result, and if the food supply decreases a smaller population would likely result

Answer 3

Population-Limiting factors

Question 4

any factor in the environment that does not depend on the number of members in a population per unit area is a

Answer 4

density-independent factor

Question 5

is a density-independent factor that can limit population growth

Answer 5

crown fire

Question 6

can promote growth in a forest community

Answer 6

small ground fires

Question 7

have been damaged by a crown fire, a fire that advances to the tops of the trees

Answer 7

ponderosa pines

Question 8

any factor in the environment that depends on the number of members in a population per unit area is a

Answer 8

density-dependent factor

Question 9

density-dependent factors are often

Answer 9

biotic

Question 10

density-independent factors are often

Answer 10

abiotic

Question 11

a number of small fish that was reduced during 1960s and dropped so low that they were in danger of disappearing from the Colorado River altogether

Answer 11

humpback chub fish

Question 12

where were the humpback chub fish reduced ?

Answer 12

Colorado River

Question 13

is the term ecologist uses to describe number of individuals moving into a population

Answer 13

immigration

Question 14

when data rises over a period of time, creating an upwards trending curve on a graph ( j shape)

Answer 14

exponential growth

Question 15

the period of time where growth is slow because of the species adaptation to the surroundings

Answer 15

lag phase

Question 16

occurs when the growth rate decreases as the population reaches carrying capacity. ( s shape)

Answer 16

logistic growth

Question 17

can be defined as a species’ average population size in a particular habitat. The species population size is limited by environmental factors like adequate food, shelter, water, and mates. If these needs are not met, the population will decrease until the resource rebounds.

Answer 17

carrying capacity (K-strategy)

Question 18

is a larger organism that has a long life span, produces few offspring, and whose population reaches equilibrium at the carrying capacity, and invest more energy in raising young

Answer 18

K-strategist

Question 19

The number of individuals in a population of K-strategists (elephants) usually are controlled by

Answer 19

density-dependent factors

Question 20

tend to occur when population size has increased and population density is high

Answer 20

disease

Question 21

resources such as food or space become limited so individuals compete for the available resources to survive and result in a decrease of population size

Answer 21

competition

Question 22

is a density-dependent factor that can negatively affect population growth at higher densities

Answer 22

parasites

Question 23

explains how fast a given population grows

Answer 23

population growth

Question 24

is defined as the rate of birth per unit area of people per unit of time.

Answer 24

Natality

Question 25

is the number of deaths of organisms in a population of a particular location over time

Answer 25

Mortality

Question 26

is a term ecologists use to describe the number of individuals moving away from a population

Answer 26

Emigrating

Question 27

Adapted for fluctuating
environment , generally are those that have shorter lifespans, are generally smaller, produce many young, and exhibit exponential growth.

Answer 27

R-strategy