Topic 4 Past Exam MC questions
1.
Which organisms externally digest dead organic matter and then absorb the nutrients?
A.
Autotrophs
B.
Detritivores
C.
Heterotrophs
D.
Saprotrophs
(Total 1 mark)
2.
What are the two components of an ecosystem?
A.
Community and abiotic environment
B.
Species and habitat
C.
Habitat and abiotic environment
D.
Species and community
(Total 1 mark)
3.
What units are used when constructing pyramids of energy?
A.
J
B.
J m–2
C.
J m–2 year–1
D.
J kg–1 m–2 year–1
(Total 1 mark)
1
Topic 4 Past Exam MC questions
4.
What are the main sources of carbon dioxide on earth?
A.
Cellular respiration of consumers, producers and combustion of fossil fuels
B.
Photosynthesis and cellular respiration of consumers
C.
Cellular respiration of producers and combustion of fossil fuels
D.
Photosynthesis and combustion of fossil fuels
(Total 1 mark)
5.
The diagram below is a simplified version of a food web from Chesapeake Bay. The arrows
indicate the direction of energy flow and the numbers indicate species within the food web.
At which trophic level or levels does species II function?
A.
2nd and 3rd consumer
B.
3rd consumer
C.
3rd and 4th consumer
D.
Producer
(Total 1 mark)
2
Topic 4 Past Exam MC questions
6.
What is the ecological role of saprotrophic bacteria?
A.
To recycle energy in dead organic matter
B.
To digest dead organic matter and release nutrients from it
C.
To ingest dead organic matter and prevent it from accumulating
D.
To produce dead organic matter by killing organisms
(Total 1 mark)
7.
The diagram below shows a simplified version of the carbon cycle.
CO2 in atmosphere
I
II
Fuels
Plants
Secondary
Consumer
Primary
Consumer
What processes are involved in the transfer of carbon at stages I and II?
I
II
A.
combustion
photosynthesis
B.
photosynthesis
respiration
C.
combustion
respiration
D.
fossilization
respiration
(Total 1 mark)
3
Topic 4 Past Exam MC questions
8.
The food web below shows a community in central France 24 000 years ago.
Salix
herbacea
Lemmus
lemmus
Alopex
lagopus
Betula
nana
Vaccinium
oxycoccos
Ursus
spelaeus
Lepus
arcticus
Canis
lupus
Rangifer
tarandus
Cladonia
rangiferina
Megaloceros
giganteus
Homo
sapiens
Graminaceae
Mammuthus
primigenius
Which statement is a correct description of Ursus spelaeus?
A.
It is an omnivore which feeds on Lemmus lemmus.
B.
It is a producer preyed upon by Vaccinium oxycoccos.
C.
It is a top carnivore and a primary consumer.
D.
It is a decomposer and it competes with Rangifer tarandus.
(Total 1 mark)
4
Topic 4 Past Exam MC questions
9.
Consider the simple food web below.
Q
P
T
R
S
Which organism could be a saprotroph?
A.
P
B.
Q
C.
S
D.
T
(Total 1 mark)
10.
What is an ecosystem?
A.
A species and its abiotic environment
B.
A community and its abiotic environment
C.
The habitat where a species lives
D.
A population of organisms in a specific habitat
(Total 1 mark)
11.
What is the initial energy source for all terrestrial communities?
A.
Water
B.
Photosynthesis
C.
Light
D.
Glucose
(Total 1 mark)
5
Topic 4 Past Exam MC questions
12.
What name is given to an organism that is able to manufacture its own food from simple
chemical materials?
A.
Heterotroph
B.
Saprotroph
C.
Autotroph
D.
Detritivore
(Total 1 mark)
13.
In ecology, what is meant by the term community?
A.
A group of populations living and interacting in the same area
B.
A group of organisms of the same species living and interacting in the same area
C.
A group of organisms which can interbreed and produce fertile offspring
D.
The environment in which a species normally lives
(Total 1 mark)
6