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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
1. Define the following terms:
Species
Habitat
Population
Community
Ecosystem
Ecology
Niche
Biodiversity
1. Outline six factors that affect the distribution of plant species.
2. Explain how the following factors affect the distribution of animal species:
Factor
Effect on the distribution of animals
Temperature
Water
Food Supply
Breeding sites
Territory
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
3. Explain what is meant by the niche concept, with an example species in its niche.
4. Distinguish between fundamental and realized niches.
5. Explain the following interactions between species, giving examples of each:
Herbivory
Predation
Intraspecific competition
Interspecific competition
Parasitism
Mutualism
6. Explain the competitive exclusion principle.
7. Give synonyms for the following terms:
Primary consumer
Secondary consumer (and above)
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
8. Complete the tree below with definitions and examples of each type of feeding strategy.
Can you distinguish between the feeding strategies at each level?
9. Food chains represent the flow of energy and nutrients in a series of feeding relationships.
Give one example of a marine food chain (min. 4 organisms)
Give one example of a terrestrial food chain (min. 4 organisms)
Give one other example of a food chain (min. 4 organisms)
10. Describe what is meant by a food web.
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
11. The food web below shows some coral reef feeding relationships;
a. Identify species in the following trophic levels:
i. Producers
ii. Primary consumers
iii. Secondary consumers
12. On a separate sheet, construct a freshwater food web based on the following information:
Organism
Energy sources
Water crowfoot
Sunlight
Cased caddisfly larva
Micro-plants, algae, particles of dead plants and animals
Damselfly nymph
Micro-plants, algae, particles of dead plants and animals
Mayfly nymph
Micro-plants, algae, particles of dead plants and animals
Dragonfly
Other adult insects and small flies
Duck
All nymphs, all plants, snails, tadpoles, young frogs
Freshwater Shrimp
Particles of dead plants and animals
Water vole
Plants
Algae
Sunlight
Otter
Fish, frogs and newts
Water starwort
Sunlight
Pond snail
Microplants, all water plants and algae
Alderfly nymph
Micro-plants, algae, particles of dead plants and animals
Pond skater
Particles of dead plants and animals
Frog
Mayfly, midge larvae, pond skater, caddisfly, small flies
Tadpole
Micro-plants, algae
Micro-plants
Sunlight
Great diving beetle
Water flea, snails, tadpole, all nymphs
Bullhead fish
Diving beetle, tadpole, all nymphs, water flea, snail, midge larvae
Adapted from: http://www.cornwallriversproject.org.uk/education/education_pack.htm
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
13. For the food web created above:
a. Identify organisms in each of the trophic levels. Do any fit more than one trophic level?
b. Which could be classed as detritivores?
14. Why is it sometimes difficult to classify organisms into trophic levels?
15. Why are the numbers of organisms usually smaller higher up the trophic levels?
16. What is the original source of energy for almost all communities?
17. Use the table below to summarize the stages of photosynthesis:
Light-independent (Calvin cycle)
Light-dependent
Stage
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Summary
Photolysis
Photophosphorylation
Reduction of NADP+
Carbon fixation
Reduction of
glycerate-3-phosphate
Glucose phosphate
production
Regeneration of RuBP
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
18. What are the functions of the following molecules in photosynthesis?
Photosystem I and II
ATP synthetase
ATP
NADPH
Rubisco
CO2
19. What is the function of a pyramid of energy?
20. Give an example of a unit of measurement used in a pyramid of energy, giving a description of
each component.
21. Define the following terms:
Gross production
Net Production
22. Explain why gross production is always higher than net production.
23. Write the calculation used for determining gross production, net production and respiration.
24. a. Draw a simple pyramid of energy based on this information:
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
25. Energy transfers are never 100% efficient.
In which ways is energy lost between trophic levels?
26. Study the energy flow diagram below:
a. Calculate the net production of the autotrophs.
b. Calculate the percentage of energy lost as heat in:
i.
Autotrophs
ii. Heterotrophs
c. Suggest reasons for the difference in part b.
27. “Energy flows through an ecosystem, nutrients are recycled.”
Explain this statement with the aid of a flow chart.
Include the roles of saprotrophic bacteria and fungi.
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
28. Define biomass.
29. Suggest some reasons for studying the biomass of an ecosystem.
30. Outline one method for estimating the biomass of different trophic levels of an ecosystem.
How do researchers ensure both minimal impact and maximal reliability of results?
31. Explain why biomass is generally low at higher trophic levels.
32. Distinguish between primary and secondary succession, with two examples of each.
Primary succession
Secondary succession
33. Describe the effects of succession on the following factors:
Productivity
Biomass
Biodiversity
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
34. In what ways do living organisms affect the abiotic environment in primary succession?
Soil composition & strength
Organic nutrients
Mineral Nutrients
Water uptake
35. Distinguish between biome and biosphere.
36. Complete the climographs for these biomes. Make notes on vegetal characteristics below each.
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37. Although biomes can be described separately, they tie in to the global biosphere.
Explain how biomes are distributed, with reference to rainfall and temperature.
38. Draw a box diagram to show the effects of natality, mortality, immigration and emigration on a
population:
39. Under which conditions will a population:
a. Grow
b. Decline
40. In the space below, draw a population growth curve.
Annotate it to explain the exponential, transition and plateau phases and carrying capacity.
41. What are three factors that set limits to population growth?
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
42. Random sampling can be used to estimate the population of a plant species in an area.
a. Explain how the researcher may make sure the samples taken are:
i.
Random
ii.
Reliable
b. Quadrats are used to estimate the coverage or number of individuals present.
In the space below, draw a diagram to explain how a quadrat is used and how results are
determined and recorded.
c. The data collected can be used to compare the populations of two or more species.
Species
A
B
i.
12
7
Percentage cover in each quadrat (±2%)
34
32
45
12
34
46
12
9
23
5
4
12
5
8
mean
STDEV
54
2
Calculate the mean and standard deviation of each set of results.
ii. What does the standard deviation tell us about these data?
iii. Which statistical test could be used to determine the significance of any difference
between the two populations?
iv. H0 =
Confidence limit usually chosen in Biology:
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v. The value of t was calculated as 3.995.
Use the t-table to determine the significance
of the results.
n=
Degrees of freedom (n-2) =
Critical value =
Is ‘t’ greater than or less than the critical value?
Therefore reject/ accept H0.
There is / is no significant difference in distribution of species
A and species B.
Can you also complete this using Excel?
43. What is the function of a transect?
44. Explain how a transect would be carried out to correlate the distribution of a species with and
abiotic variable.
45. What is meant by the term “correlation does not necessarily imply causation”?
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
46. What is the function of Simpson’s Diversity Index?
47. Describe how Simpson’s Index could be used to compare two parts of a stream.
48. Use Simpson’s Diversity Index to compare these communities:
Grassland Site 1
Species
A
B
C
D
E
F
G
H
Present
y
y
y
x
x
x
x
x
N=
number
65
12
8
0
0
0
0
O
Σn=
B
C
D
E
F
G
H
3
N-1=
2
n-1=
Simpson’s Index:
Grassland Site 2
Species
A
Present
y
X
y
y
y
y
y
y
N=
number
12
o
32
21
08
6
07
4
Σn=
7
N-1=
6
n-1=
Simpson’s Index:
Which one of these sites was farmed grassland? Which was left to go wild? Explain your answer.
49. Discuss the following reasons for conservation of biodiversity in rainforests:
Ethical/moral
Economical
Economical
Aesthetic
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
50. Define alien species.
51. Give examples of the introduction of the following types of invasive species and their impacts:
Intentional Introduction: food source
Intentional Introduction: biological control
Accidental Introduction: human exploration
Accidental Introduction: shipping or globalization
52. How do alien species have the following impacts on ecosystems? Give examples.
Predation
Interspecific competition
Habitat destruction
Biological control
Extinction
53. Describe how RHDV has been used as biological control in Australia.
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54. Distinguish between bioaccumulation and biomagnification.
55. Using a diagram or flow-chart, describe the cause and consequences of one named example of
biomagnification.
56. In the space below, draw and annotate a diagram to show the carbon cycle and processes
involved.
57. Outline some of the methods used to measure or estimate atmospheric carbon dioxide.
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
58. The topic of increasing carbon dioxide levels in the atmosphere has been the source of intense
debate with regard to climate change in recent years.
a.
b.
Describe the overall trend shown in the graph.
Suggest one human impact and one natural cause that could have led to the overall trend
shown in the graph:
Human:
Natural:
c.
Identify with an arrow any one point where the graph is in mid-summer.
d.
Explain the seasonal fluctuations in CO2 levels.
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
59.
Explain, with the aid of a diagram, the greenhouse effect.
60.
Identify three greenhouse gases other than carbon dioxide.
61.
Explain how increased atmospheric levels of greenhouse gases lead to an enhanced
greenhouse effect.
62.
Outline some of the possible consequences of a global temperature rise on arctic
ecosystems.
63.
What is the precautionary principle?
64.
How does the precautionary principle apply to human impacts and global warming?
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65.
66.
Give two other examples of the precautionary principle in effect in Biology or Medicine.
Evaluate the precautionary principle as a justification for taking strong action in response
to the threats posed by the enhanced greenhouse effect. What are some of the steps that we
could take?
67.
What is ozone and what is its function in the stratosphere.
68.
Outline the effect of CFC’s on the ozone layer.
69.
Outline the effects of UV radiation on living tissues and biological productivity.
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
70.
Define evolution.
71.
a.
Populations tend to produce more offspring than the environment can support.
What is the consequence of this?
b.
What is the significance of variation within a species in relation to survival?
c.
How does sexual reproduction lead to variation within a species?
Meiosis
Random fertilization
Mate selection
d.
72.
How does the struggle for survival lead to natural selection?
Explain antibiotic resistance in bacteria as an example of evolution.
Environmental change =
Variation allowed…
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
And so…
73.
Explain one other example of evolution of a species, in response to environmental
change.
(Galapagos finches or pepper moths)
74.
In what way do the following types of evidence support the theory of evolution?
Fossil Record
Homologous structures
Selective breeding of domesticated animals
75.
In the space below, explain how the Linnean binomial system of nomenclature works,
paying attention to formatting conventions.
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76.
77.
Define taxonomy.
In the table below, list the seven levels in the hierarchy of taxa. Using two examples from
different kingdoms give all seven levels.
Hierarchical level
Example 1:
Example 2:
Most
diverse
Most
Specific
78.
Distinguish between the following phyla of plants, using external characteristics. Give
examples.
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
79.
Distinguish between the following phyla of animals, using external recognition features
and giving examples.
80.
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Design and apply a dichotomous key to help you identify these beetles:
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
Questions from here on apply only to Higher Level students.
81.
Define biotic index.
82.
Outline how a tolerance rating can be applied to a species.
83.
List some examples of freshwater invertebrate species which are indicators
of:
a.
Good water quality
b.
Poor water quality
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
84.
Annotate the equation below to show the components of a biotic index
calculation.
85.
Calculate and compare the biotic indexes of these two locations:
Species
A
B
C
D
E
ni
0
0
2
9
12
N=
Site 1
ai
10
8
6
4
2
ni x ai
Σ(ni x ai) =
ni
2
6
1
3
0
N=
Biotic Index =
Site 2
ai
10
8
6
4
2
ni x ai
Σ(ni x ai) =
Biotic Index =
Conclusion:
86.
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How does the application of a biotic index differ from a diversity index?
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87.
How might biotic and/or diversity index data be used in the monitoring of an
ecosystem?
88.
Describe how the extinction of the dodo came about.
Event:
Effects:
Why was the dodo vulnerable?
Suggest some measures that could have been taken to prevent the extinction of the dodo.
89.
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Complete the following Structured Data Analysis question:
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a.
b.
State the percentage of species in some way affected by habitat loss.
Calculate the approximate number of bird species threatened by
persecution/ predation only.
c.
90.
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State two factors that could have caused habitat loss.
What is a nature reserve?
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91.
How do the following biogeographical features of nature reserves aid in
species conservation?
Give examples of species that can take advantage of each of these effects.
Size
Habitat corridors
Edge Effect
92.
Explain how the edge effect can have a negative impact on reserves which
are small in size.
93.
What is active management with regard to conservation?
94.
a.
b.
c.
d.
e.
Which of the following qualify as active management strategies?
Culling invasive species
Leaving an area to grow wild
Fencing off an area to prevent poachers from gaining entry
Building new habitats
Replanting vegetation
95. Using an Indonesian example, discuss how active management of a nature reserve has had a
positive impact on biodiversity.
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
96. Distinguish between in-situ and ex-situ conservation of endangered species.
97. Complete the table to give the advantages and some plant and animal examples of in-situ and
ex-situ conservation measures.
In-situ
Ex-situ
Advantages
Plant examples
Animal examples
98. Outline how the following ex-situ methods can help in conservation of endangered species:
Seed banks
Botanic Gardens
Captive breeding
99. Annotate the equation below to the show the components of a calculation of rate of change of a
population:
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
100.
Distinguish between r- and K-strategists in terms of the following characteristics:
r-strategists
K-strategists
Examples
Life span
Growth & size
Age at maturity
Number of offspring
Number of reproductive events
Competition
Favoured environmental
conditions
101.
As always in Biology, there is no black and white, but a spectrum.
Arrange the following species on a r-K spectrum:
(elephants, bacteria, oak trees, humans, mice, mosquitoes, algae, frogs)
102.
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Discuss the use of the Lincoln Index, as shown in the diagram:
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
103.
What are some of the ethical considerations of a capture-mark-recapture technique?
104.
What are some of the practical difficulties associated with a capture-mark-recapture
technique?
105.
What is a commercial fish stock?
106.
How can the following methods be used to estimate the size of commercial fish stocks?
Fish catch data
Capture-Mark-Recapture
Echolocation or Satellite data
107.
What are the ecological and economical impacts of overfishing?
108.
When setting catch limits, which groups might be considered as stakeholders in the
decision?
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
109.
Answer this Structured Data Analysis question on fish catch data.
a. Calculate the percentage of the world catch that came from the Atlantic in 1990.
b. Compare the Pacific and Atlantic data.
c. Suggest one reason in each case for the change in catch in the Indian and Atlantic
oceans between 1980 and 1990.
Indian:
Atlantic:
110.
Outline the concept of maximum sustainable yield.
111.
How does the precautionary principle apply when setting international catch limits?
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ESSENTIAL BIOLOGY 05: ECOLOGY, EVOLUTION & CONSERVATION
112.
Discuss how the following international measures may aid the conservation of fish
stocks:
International cooperation
Stakeholder identification and agreement
Independent research and monitoring
Mapping
Subsidies
Legalisation and enforcement
Education and awareness
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