Ecosystems Chapter 20

Question 1

What is largest ecosystem?

Answer 1

biosphere

Question 2

Define biotic

Answer 2

living (all organisms; plants, animals)

Question 3

Define abiotic

Answer 3

non-living (sunlight, wind, soil type)

Question 4

Natural disturbance examples are?

Answer 4

fires,floods,avalanches,rockslides

Question 5

Human caused disturbances examples?

Answer 5

pollution
acid rain
deforestation
overfishing
oil

Question 6

What’s is equilibrium?

Answer 6

a dynamic state of an ecosystem in which, biodiversity remains somewhat constant

Question 7

What is resistance?

Answer 7

ability of an ecosystem to remain at equilibrium in spite of disturbances

Question 8

What is resilience?

Answer 8

the speed at which an ecosystem recovers equilibrium after being disturbed

Question 9

What are the 4 trophies levels

Answer 9

producers (plants)
primary consumers (herbivores)
secondary consumer (carnivores)
tertiary consumers (carnivores that eat secondary consumers)

Question 10

Where does lowest trophic level get energy from?

Answer 10

sun

Question 11

What do omnivores eat? Examples?

Answer 11

plants and animals (ex. racoons,bears, humans)

Question 12

The environment is the sum of __________________________?

Question 13

How much energy flows to the next tropic level? What is the energy lost as?

Answer 13

10%
energy is lost as heat

Question 14

The final link in the food chain is the _______________. What do they do?

Question 15

Concentration of some toxic substances as you go up the trophic levels is called
what?

Answer 15

toxic substances will increase as you go up the trophic levels.

Question 16

The elements needed for living organisms are recycled between living organisms and
their non-living environment. These cycle are?

Answer 16

Biogeochemical Cycles

Question 17

Why is it cooler in winter in the North?

Answer 17

Sun angle indirect in winter in North

Question 18

Why is it warmer in summer in the North?

Answer 18

Sun angle more direct in summer in North

Question 19

Is biome wet or dry?

Answer 19

both wet and dry

Question 20

Is the biome cold or hot?

Answer 20

both

Question 21

Aquatic /Marine environments represent what amount of the earth’s biosphere?

Answer 21

Represent the largest portion of earth’s biosphere

Question 22

Which term describes the process whereby toxic substances increase as you go up trophic levels?
a. Biogeoification
b. Biomagnification
c. Bioentropy
d. Heterotrophy

Answer 22

b. Biomagnification

Question 23

The majority of the water on Earth is found as:
a. Ice
b. Water vapor
c. Freshwater
d. Saltwater

Answer 23

d. Saltwater

Question 24

Humans are:
a. Omnivores
b. Herbivores
c. Carnivores
d. None of these

Answer 24

a. Omnivores

Question 25

Which of the following biomes is severely cold, treeless and has permafrost?
a. Desert
b. Tundra
c. Tropical Rain Forest
d. Savanna

Answer 25

b. Tundra