Global change

Question 1

What is agriculture?

Answer 1

Geographic separation between where food is grown and where it is consumed

Question 2

what is BNF?

Answer 2

Biological nitrogen fixation
mostly by microbes
Makes nitrogen available in plants

Question 3

Importance of nutrient enrichment

Answer 3

• eutrophication in aquatic ecosystems
• biodiversity loss in terrestrial ecosystems

Question 4

Biological magnification = ?

Answer 4

When toxins are not excreted

Question 5

Pharmaceuticals

Answer 5

Feminisation of male fish due to chemicals with estrogenic properties

Question 6

Plastic waste

Answer 6

Mechanical problems - animals ingest and starve
Leaching of chemicals

Question 7

Increased CO2 leads to global warming through

Answer 7

the greenhouse effect

Question 8

Impacts of the greenhouse effect:

Answer 8

• range shifts
• disrupted species interactions
• coral bleaching

Question 9

Process of the greenhouse effect

Answer 9

1. solar radiation passes through atmosphere
2. some absorbed, warming earth’s surface
3. some energy emitted as heat
4. emitted heat trapped by greenhouse gases

Question 10

Increased CO2 leads to…

Answer 10

Ocean acidification

Question 11

Impacts of increased CO2:

Answer 11

Less calcium carbonate for building and maintaining calcified structures by organisms

Question 12

Depletion of atmospheric ozone

Answer 12

Chlorofluorocarbons (CFC) pollution thins layer of O3 in stratosphere that filters UV

Question 13

Impacts of depletion of ozone:

Answer 13

• DNA damage
• Leads to cancers in humans
• Reduced growth in phytoplankton

Question 14

Good news for CFC?

Answer 14

CFC production ceased so atmospheric chlorine stabilised and erosion of ozone layer has slowed