Unit 3 Ecology Quiz

Question 1

Abiotic factors in water

Answer 1

Sunlight
Turbidity (cloudiness due to suspended particles)
Dissolved oxygen
Temperature 
PH
Salinity

Question 2

Dissolved oxygen

Answer 2

Determined the life that can exist

Colder water = more dissolved oxygen

Question 3

Increase in dissolved oxygen levels

Answer 3

Mixing
Low salt concentrations
Increased microscopic photosynthetic organisms and plants

Question 4

Meromictic lakes

Answer 4

Deep with steel walls
Don’t turn over
18-20m deep = layer of sulfur bacteria

Question 5

Niche

Answer 5

The place and the role

Question 6

Biological magnification/bioaccumulation

Answer 6

Flow of toxic chemicals through an ecosystem

-DDT

Question 7

Hydrologic cycle

Answer 7

Transpiration
Evaporation
Condensation
Precipitation

Question 8

Carbon cycle (CHO cycle)

Answer 8

CO2 is removed by photosynthesis

• make sugars
• people and plants give off CO2 in cellular respiration
• decomposed recycle CO2

Question 9

Nitrogen cycle

Answer 9

Organisms use nitrogen to make proteins and DNA

Nitrogen fixation - Cyanobacteria capture nitrogen from air

Nitrification - other bacteria concert NH3 to nitrites and nitrates
*plants use nitrates to form DNA/RNA

Denitrification - conversion of nitrates to nitrogen gas

Question 10

Phosphorus cycle

Answer 10

Organisms use phosphorus for ATP, DNA/RNA, and phospholipids

-mycorrhizae capture phosphorus from the soil –> plant

Question 11

Ecological succession

Answer 11

Progression of an ecosystem through time

Question 12

Primary succession

Answer 12

Occurs on land where nothing has grown before (no soil)

Question 13

Secondary succession

Answer 13

Area that has been disturbed and it gradually returns to its original condition

Question 14

Climax community

Answer 14

The final succession stage in a biome

Question 15

Solar radiation

Answer 15

Angle of sunlight