DP Biology (last assessment 2024)

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Option C: Ecology and conservation » Option C: Ecology and conservation (Additional higher level topics)

Option C: Ecology and conservation (Additional higher level topics)

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Directly related questions

20N.3.HL.TZ0.19: Suggest how nitrogen and phosphate cycles can be disrupted by humans or extreme weather events.
20N.3.HL.TZ0.19: Suggest how nitrogen and phosphate cycles can be disrupted by humans or extreme weather events.
17N.3.HL.TZ0.15a.i: State the range of years when exponential growth of the M. gallopavo population occurred.
17N.3.HL.TZ0.15a.i: State the range of years when exponential growth of the M. gallopavo population occurred.
17N.3.HL.TZ0.a.i: State the range of years when exponential growth of the M. gallopavo population occurred.
17N.3.HL.TZ0.15a.ii:
Suggest factors that could account for the growth curve of the M. gallopavo population.
17N.3.HL.TZ0.15a.ii:
Suggest factors that could account for the growth curve of the M. gallopavo population.
17N.3.HL.TZ0.a.ii:
Suggest factors that could account for the growth curve of the M. gallopavo population.
17N.3.HL.TZ0.15b: State how the population of M. gallopavo may have been determined.
17N.3.HL.TZ0.15b: State how the population of M. gallopavo may have been determined.
17N.3.HL.TZ0.b: State how the population of M. gallopavo may have been determined.
17N.3.HL.TZ0.15c:
Hunting of M. gallopavo is currently regulated. Predict what would happen if the hunting regulations were removed.
17N.3.HL.TZ0.15c:
Hunting of M. gallopavo is currently regulated. Predict what would happen if the hunting regulations were removed.
17N.3.HL.TZ0.c:
Hunting of M. gallopavo is currently regulated. Predict what would happen if the hunting regulations were removed.
17N.3.HL.TZ0.18:
Discuss the causes and consequences of eutrophication.
17N.3.HL.TZ0.18:
Discuss the causes and consequences of eutrophication.
18N.3.HL.TZ0.16b: Explain how eutrophication can occur from the excessive use of phosphates.
18N.3.HL.TZ0.16b: Explain how eutrophication can occur from the excessive use of phosphates.
18N.3.HL.TZ0.b: Explain how eutrophication can occur from the excessive use of phosphates.
18N.3.HL.TZ0.16a: Describe reasons that the availability of phosphates may become limiting to agriculture in the...
18N.3.HL.TZ0.16a: Describe reasons that the availability of phosphates may become limiting to agriculture in the...
18N.3.HL.TZ0.a: Describe reasons that the availability of phosphates may become limiting to agriculture in the...
18N.3.HL.TZ0.17: Explain how an ecological community structure could be affected by the removal of a keystone...
18N.3.HL.TZ0.17: Explain how an ecological community structure could be affected by the removal of a keystone...
18M.3.HL.TZ1.17a.i: State the type of growth of this population up to 1940.
18M.3.HL.TZ1.17a.i: State the type of growth of this population up to 1940.
18M.3.HL.TZ1.a.i: State the type of growth of this population up to 1940.
18M.3.HL.TZ1.18:
Explain how human activities could affect the phosphorus cycle.
18M.3.HL.TZ1.18:
Explain how human activities could affect the phosphorus cycle.
18M.3.HL.TZ1.17a.ii: Suggest one possible cause for the decrease of the number of animals after 1940.
18M.3.HL.TZ1.17a.ii: Suggest one possible cause for the decrease of the number of animals after 1940.
18M.3.HL.TZ1.a.ii: Suggest one possible cause for the decrease of the number of animals after 1940.
18M.3.HL.TZ2.15c: Explain how nutrients can have a positive or negative bottom-up effect on seagrass.
18M.3.HL.TZ2.15c: Explain how nutrients can have a positive or negative bottom-up effect on seagrass.
18M.3.HL.TZ2.c: Explain how nutrients can have a positive or negative bottom-up effect on seagrass.
19M.3.SL.TZ1.11c: Suggest one way in which depth may act as a limiting factor for coral.
19M.3.SL.TZ1.11c: Suggest one way in which depth may act as a limiting factor for coral.
19M.3.SL.TZ1.c: Suggest one way in which depth may act as a limiting factor for coral.
19M.3.HL.TZ1.19:
The garden snail, Helix aspersa, is a herbivore.

[Source: Sinan Önder /https://www.pexels.com/photo/animal-close-up-crawling-garden-243128/]

Explain how the population of snails in an ecosystem could be estimated by capture-mark-release-recapture, identifying the limitations in the method.
19M.3.HL.TZ1.19:
The garden snail, Helix aspersa, is a herbivore.

[Source: Sinan Önder /https://www.pexels.com/photo/animal-close-up-crawling-garden-243128/]

Explain how the population of snails in an ecosystem could be estimated by capture-mark-release-recapture, identifying the limitations in the method.
19M.3.HL.TZ2.18:
Commercial fertilizers are often applied to agricultural land. Discuss the use of fertilizers on crops and their effect on other ecosystems.
19M.3.HL.TZ2.18:
Commercial fertilizers are often applied to agricultural land. Discuss the use of fertilizers on crops and their effect on other ecosystems.
19N.3.HL.TZ0.18:
Explain the technique used to estimate the population size of a named species of organism that is able to move.
19N.3.HL.TZ0.18:
Explain the technique used to estimate the population size of a named species of organism that is able to move.
19N.3.HL.TZ0.17c: Describe the major characteristics of a eutrophic lake.
19N.3.HL.TZ0.17c: Describe the major characteristics of a eutrophic lake.
19N.3.HL.TZ0.c: Describe the major characteristics of a eutrophic lake.
19N.3.HL.TZ0.17a:
The figure below shows the effects of soil pH on nutrient availability. Thicker bars indicate higher nutrient availability.

[Source: diagram drawn from Emil Truog, 1947, The Liming of Soils, USDA Yearbook of Agriculture 1943–1947,
and N.A. Pettinger, 1935, A Useful Chart for Teaching the Relation of Soil Reaction to the Availability of Plant
Nutrients to Crops, Virginia Cooperative Extension, Virginia Tech, and Virginia State University]

Identify which element is more available in strongly acid conditions.
19N.3.HL.TZ0.17a:
The figure below shows the effects of soil pH on nutrient availability. Thicker bars indicate higher nutrient availability.

[Source: diagram drawn from Emil Truog, 1947, The Liming of Soils, USDA Yearbook of Agriculture 1943–1947,
and N.A. Pettinger, 1935, A Useful Chart for Teaching the Relation of Soil Reaction to the Availability of Plant
Nutrients to Crops, Virginia Cooperative Extension, Virginia Tech, and Virginia State University]

Identify which element is more available in strongly acid conditions.
19N.3.HL.TZ0.a:
The figure below shows the effects of soil pH on nutrient availability. Thicker bars indicate higher nutrient availability.

[Source: diagram drawn from Emil Truog, 1947, The Liming of Soils, USDA Yearbook of Agriculture 1943–1947,
and N.A. Pettinger, 1935, A Useful Chart for Teaching the Relation of Soil Reaction to the Availability of Plant
Nutrients to Crops, Virginia Cooperative Extension, Virginia Tech, and Virginia State University]

Identify which element is more available in strongly acid conditions.
19N.3.HL.TZ0.17b: Outline the roles of Rhizobium bacteria in the nitrogen cycle.
19N.3.HL.TZ0.17b: Outline the roles of Rhizobium bacteria in the nitrogen cycle.
19N.3.HL.TZ0.b: Outline the roles of Rhizobium bacteria in the nitrogen cycle.
18M.3.SL.TZ1.12c: State one method that could be used to estimate the isopod population size.
18M.3.SL.TZ1.12c: State one method that could be used to estimate the isopod population size.
18M.3.SL.TZ1.c: State one method that could be used to estimate the isopod population size.
19M.3.HL.TZ2.16a:
Explain the factors that can contribute to the exponential growth phase in a sigmoid population curve.
19M.3.HL.TZ2.16a:
Explain the factors that can contribute to the exponential growth phase in a sigmoid population curve.
19M.3.HL.TZ2.a:
Explain the factors that can contribute to the exponential growth phase in a sigmoid population curve.
19M.3.HL.TZ2.16b: Outline the effect of carrying capacity on the growth of a population.
19M.3.HL.TZ2.16b: Outline the effect of carrying capacity on the growth of a population.
19M.3.HL.TZ2.b: Outline the effect of carrying capacity on the growth of a population.
23M.3.HL.TZ1.16a:
Outline how the prickly pear cactus may become an ecological problem in Kruger National Park.
23M.3.HL.TZ1.16a:
Outline how the prickly pear cactus may become an ecological problem in Kruger National Park.
23M.3.HL.TZ1.a:
Outline how the prickly pear cactus may become an ecological problem in Kruger National Park.

Sub sections and their related questions

C.5 Population ecology

17N.3.HL.TZ0.15a.i: State the range of years when exponential growth of the M. gallopavo population occurred.
17N.3.HL.TZ0.15a.ii:
Suggest factors that could account for the growth curve of the M. gallopavo population.
17N.3.HL.TZ0.15b: State how the population of M. gallopavo may have been determined.
17N.3.HL.TZ0.15c:
Hunting of M. gallopavo is currently regulated. Predict what would happen if the hunting regulations were removed.
18M.3.SL.TZ1.12c: State one method that could be used to estimate the isopod population size.
18M.3.HL.TZ1.17a.i: State the type of growth of this population up to 1940.
18M.3.HL.TZ1.17a.ii: Suggest one possible cause for the decrease of the number of animals after 1940.
18M.3.HL.TZ2.15c: Explain how nutrients can have a positive or negative bottom-up effect on seagrass.
19M.3.SL.TZ1.11c: Suggest one way in which depth may act as a limiting factor for coral.
19M.3.HL.TZ1.19:
The garden snail, Helix aspersa, is a herbivore.

[Source: Sinan Önder /https://www.pexels.com/photo/animal-close-up-crawling-garden-243128/]

Explain how the population of snails in an ecosystem could be estimated by capture-mark-release-recapture, identifying the limitations in the method.
19M.3.HL.TZ2.16a:
Explain the factors that can contribute to the exponential growth phase in a sigmoid population curve.
19M.3.HL.TZ2.16b: Outline the effect of carrying capacity on the growth of a population.
19N.3.HL.TZ0.18:
Explain the technique used to estimate the population size of a named species of organism that is able to move.
23M.3.HL.TZ1.16a:
Outline how the prickly pear cactus may become an ecological problem in Kruger National Park.
19N.3.HL.TZ0.18:
Explain the technique used to estimate the population size of a named species of organism that is able to move.
17N.3.HL.TZ0.15a.i: State the range of years when exponential growth of the M. gallopavo population occurred.
17N.3.HL.TZ0.15a.ii:
Suggest factors that could account for the growth curve of the M. gallopavo population.
17N.3.HL.TZ0.15b: State how the population of M. gallopavo may have been determined.
17N.3.HL.TZ0.15c:
Hunting of M. gallopavo is currently regulated. Predict what would happen if the hunting regulations were removed.
17N.3.HL.TZ0.a.i: State the range of years when exponential growth of the M. gallopavo population occurred.
17N.3.HL.TZ0.a.ii:
Suggest factors that could account for the growth curve of the M. gallopavo population.
17N.3.HL.TZ0.b: State how the population of M. gallopavo may have been determined.
17N.3.HL.TZ0.c:
Hunting of M. gallopavo is currently regulated. Predict what would happen if the hunting regulations were removed.
23M.3.HL.TZ1.16a:
Outline how the prickly pear cactus may become an ecological problem in Kruger National Park.
23M.3.HL.TZ1.a:
Outline how the prickly pear cactus may become an ecological problem in Kruger National Park.
18M.3.SL.TZ1.12c: State one method that could be used to estimate the isopod population size.
18M.3.SL.TZ1.c: State one method that could be used to estimate the isopod population size.
18M.3.HL.TZ1.17a.i: State the type of growth of this population up to 1940.
18M.3.HL.TZ1.17a.ii: Suggest one possible cause for the decrease of the number of animals after 1940.
18M.3.HL.TZ1.a.i: State the type of growth of this population up to 1940.
18M.3.HL.TZ1.a.ii: Suggest one possible cause for the decrease of the number of animals after 1940.
18M.3.HL.TZ2.15c: Explain how nutrients can have a positive or negative bottom-up effect on seagrass.
18M.3.HL.TZ2.c: Explain how nutrients can have a positive or negative bottom-up effect on seagrass.
19M.3.SL.TZ1.11c: Suggest one way in which depth may act as a limiting factor for coral.
19M.3.SL.TZ1.c: Suggest one way in which depth may act as a limiting factor for coral.
19M.3.HL.TZ1.19:
The garden snail, Helix aspersa, is a herbivore.

[Source: Sinan Önder /https://www.pexels.com/photo/animal-close-up-crawling-garden-243128/]

Explain how the population of snails in an ecosystem could be estimated by capture-mark-release-recapture, identifying the limitations in the method.
19M.3.HL.TZ2.16a:
Explain the factors that can contribute to the exponential growth phase in a sigmoid population curve.
19M.3.HL.TZ2.16b: Outline the effect of carrying capacity on the growth of a population.
19M.3.HL.TZ2.a:
Explain the factors that can contribute to the exponential growth phase in a sigmoid population curve.
19M.3.HL.TZ2.b: Outline the effect of carrying capacity on the growth of a population.

C.6 Nitrogen and phosphorus cycles