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Flashcards in Humans In The Environment Deck (34)
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1
Q

Biological diversity (biodiversity)

A

variety of living organisms with regard
to
genes, species, and ecosystems.

2
Q

current biodiversity numbers

A

Currently decreasing at an alarming rate (50 to 500 times the natural
rate of background extinction)

3
Q

cause of bad biodiversity numbers

A

human activities
 Destruction of natural habitats
 Activities that produce acid rain precipitation or pollution
biotic pollution
Unregulated hunting
 Commercial harvest- removing organisms from the wild for use
deforestation

4
Q

biotic pollution

A

introduction of a foreign species into an area

where it is not native, upsetting the balance of species

5
Q

term for foreign species–biotic pollution

A

invasive species

6
Q

deforestation

A

temporary or permanent clearing of forests for agriculture or other uses

7
Q

consequences of deforestation

A

(IBSI) Increases soil erosion, decreasing soil fertility, loss of biodiversity, Surface runoff flowing into rivers and streams increases global temp, Increase global temperature by releasing carbon store in trees as CO2,
increasing the greenhouse effect, higher CO2 levels

8
Q

Slash and burn agriculture

A

farmers cut down trees, allow
them to dry, then burn the area and plant crops in the fertile soil
immediately after burning. Soil productivity declines rapidly
afterward, and farmers must move to a new area and repeat the
whole process

9
Q

why deforest?

A

Slash and burn agriculture

10
Q

Global climate change

A

Earth’s average surface temperature has increased 1.1

degree F during 20th century

11
Q

Why are CO2 and other gases

accumulating in the atmosphere?

A

due to burning of fossil fuels-

coal, oil, gas. Deforestation also leads to

12
Q

CFC

A

chlorofluorocarbons

13
Q

Ozone

A

O3

14
Q

what gases aside from CO2 are accumulating in atmosphere

A

methane, ozone, CFC

15
Q

greenhouse effect

A

CO2 and other gases
accumulating in the atmosphere absorb heat in the atmosphere, warming the
atmosphere and ocean

16
Q

why is it called the greenhouse effect?

A

Similar to the way glass traps radiation in a greenhouse

17
Q

What does global climate change lead to?

A

Change in precipitation patterns, range of habitats, more heat related deaths, Glaciers thawing=change in sea level,

18
Q

How to improve global climate change

A

Stabilize CO2 emission

19
Q

Ozone (define)

A

Form of oxygen naturally produced in stratosphere, shields surface from uv rays

20
Q

Stratosphere

A

Upper part atmosphere

21
Q

Ozone hole

A

Over Antarctica where levels decrease every year, been very rapid

22
Q

What chemical causes ozone hole?

A

CFCs, used in aerosols, ACs, refrigerators, drift up to stratosphere, broken down by UV rays and release Cl2. Sunlight promotes chemical reaction in which the Cl2 breaks ozone into O2.

23
Q

Consequences of ozone hole

A

Harms organisms–humans skin cancer, cataracts, weak immune system, ecosystems disrupted bc it kills algae, may damage crops and forests

24
Q

Help ozone hole

A

Reduce CFC

25
Q

Acid rain production-

A

Burning of fossil fuels (coal, oil) release pollutants into the air that
contain sulfur dioxide and nitrogen dioxide. these substances react with water and produce sulfuric acid and nitric acid.

26
Q

how does the acid get to earth (acid rain)

A

These substances kill plants and animals and lakes, river, and land
when they return to the surface of the Earth through
precipitation

27
Q

Desertification-

A

Overgrazing of grasslands that border deserts turn the grasslands into deserts

28
Q

result of desertification

A

Agricultural habitats decrease

Natural habitats are lost

29
Q

biological magnification

A

As one organism eats another, it becomes more and more concentrated

30
Q

Where in pollution does biological magnification occur?

A

DDT

31
Q

DDT

A

pesticide

32
Q

eutrophication

A

Lake can be polluted with runoff fertilizer or sewage- adding
abundant nutrients.

33
Q

eutrophication- stimulates

A

algal blooms

34
Q

algal blooms

A

massive growths of algae, which reduce
oxygen supplies through respiration. After they die, they are
consumed by detritivorous bacteria, which further reduces the
oxygen. This causes Oxygen starvation for many animals, and algae blocks the sun, so whole lake dies.