Unit 3

Question 1

Global Extinction Rate is _____ times higher than it was prehistorically

Answer 1

10-10,000

Question 2

2-200 species become

Answer 2

Extinct every day

Question 3

Factors related to increase in loss of biodiversity? (6 major)

Answer 3

Habitat loss and degradation
Invasive species
Hunting, overfishing, poaching
Sale of exotic species
Pollution
Climate change

Question 4

_____% of Earth’s surface has been taken over by human activity

Answer 4

40-50%

Question 5

Global Forest cover has been reduced by ____%

Answer 5

20-50%

Question 6

____ of all wetlands lost in ____

Answer 6

Half—last century

Question 7

Over ___% of all virgin forests in US have been cleared since 1620

Answer 7

90%

Question 8

___% of Prairies cleared

Answer 8

98%

Question 9

Human-related intrinsic value of BD

Answer 9

Utilitarian uses including the development of drugs for Human betterment (medications)
the world’s species have gone largely untapped–more to be gleaned for this purpose

Question 10

Non-human related intrinsic value of BD

Answer 10

..

Question 11

Species Richness

Answer 11

Number of species in an area

Question 12

Relative Abundance

Answer 12

Relative numbers of species

Question 13

Taxonomic diversity

Answer 13

taxonomic relationships among species

Question 14

Greater biodiversity is found in _____ latitudes

Answer 14

Equatorial latitudes

Question 15

In water, biodiversity follows a ____ curve as depth increases

Answer 15

Bell curve

Question 16

Keystone species

Answer 16

Play pivotal role in structure and function of an
ecosystem
Interaction with other species effect health and
survival of these species
Process materials out of proportion to numbers
or biomass

Question 17

Indicator Species

Answer 17

Early warning of damage to an ecosystem
Birds- tend to respond quickly to change
Decline in songbird population indicative of
habitat loss
Decline in trout species, amphibians indicative
of water pollution

Question 18

Autotrophs

Answer 18

Capture energy from non-living environment
e.g., photosynthesis
Provide energy for heterotrophs

Question 19

Heterotrophs

Answer 19

derive energy from complex organic compounds

Question 20

1st Trophic Level

Answer 20

Producers (autotrophs)

Question 21

2nd Trophic Level

Answer 21

Primary Consumers (Herbivores) (feed off producers)

Question 22

3rd Trophic Level

Answer 22

Secondary Consumers feed on primary consumers

Question 23

Most ecosystems can sustain ____s trophic levels (#)

Answer 23

4-6

Question 24

Each trophic level assimilates ____% of energy available from previous level

Answer 24

10%

Question 25

Decomposers

Answer 25

recycle nutrients and organic

material- Nutrient cycles, Carbon cycle

Question 26

Parasites

Answer 26

Live in or on other individuals and cause harm

Question 27

Succesion

Answer 27

The change of ecosystems over time

Question 28

Pioneer Species

Answer 28

A species that colonizes an ecosystem or speeds succession along

Question 29

Climax community

Answer 29

Most stable stage of an ecosystem

Question 30

Secondary succession

Answer 30

follows a disturbance