DP Biology Questionbank

• Syllabus

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

Sub sections and their related questions

C.5 Population ecology

• 15M.3.SL.TZ2.19a (i): State the force required to detach a limpet with an area of foot of 2 cm2 .
• 15M.3.SL.TZ2.19a (ii): State the smallest area of foot necessary to resist a force of 50 N.  ...................cm2
• 15M.3.SL.TZ2.19b: Outline the relationship between area of foot and the force required to detach the limpet.
• 15M.3.SL.TZ2.19c: Smaller limpets can only be found at the back of crevices. Discuss the reasons for this.
• 15M.3.SL.TZ2.19d: Limpets tend to live towards the high tide zone. State the method used to determine the...
• 15M.3.SL.TZ1.19a: Identify the most abundant animal type at the S. muticum site:      the control site:
• 15M.3.SL.TZ1.19b: Describe the impact of invasive S. muticum on the shoreline animal community.  
• 15M.3.SL.TZ1.19c: Discuss possible reasons for the differences in the animal communities seen at the two sites.  
• 15M.3.HL.TZ2.12: Describe a named method for determining the size of fish populations and the challenges in...
• 15N.2.SL.TZ0.3a: Identify the phases labelled X and Y. X: Y:
• 15N.3.SL.TZ0.19a: State which taxonomic group shows the greatest median shift.
• 15N.3.SL.TZ0.19b: Calculate the percentage of ground beetles that are below the zero shift.
• 15N.3.SL.TZ0.19c: Compare the changes in the range of ground beetles with the changes in the range of spiders.
• 15N.3.SL.TZ0.19d: Spiders and ground beetles are both predators. Discuss possible effects on other species...
• 15N.3.HL.TZ0.10a: State the relative use of the habitat by the Great Tit in the upper crown of the tree close to...
• 15N.3.HL.TZ0.10b: Identify the section of habitat used least by the birds.
• 15N.3.HL.TZ0.10c: Compare how the Varied Tit and the Marsh Tit use the habitat in the upper crown of the tree.
• 15N.3.HL.TZ0.10d: State how the distribution of birds changes with their size in the middle crown of the tree.
• 15N.3.HL.TZ0.10e: Suggest one reason why few Varied Tits were found far from trunk.
• 13M.2.SL.TZ2.3a: List two factors that could cause an increase in the size of an animal population. 1.      ...
• 13M.3.HL.TZ2.4a: Calculate the decrease in mass of food foraged by fed sand gobies when a predator was introduced,...
• 13M.3.HL.TZ2.4b: Compare the effect that starvation had on both species of goby when no predator was present.
• 13M.3.HL.TZ2.4c (i): Describe the effect the predator had on the foraging of the gobies.
• 13M.3.HL.TZ2.4c (ii): Suggest a reason for the effect of the predator.
• 13M.3.HL.TZ2.10a: State which activity decreased in weeks 1 to 5 as a result of exposure to the falcons.
• 13M.3.HL.TZ2.10b: Estimate the total percentage of time the gulls exposed to falcons spent flying and at rest in...
• 13M.3.HL.TZ2.10c: Compare the behaviour of the gulls exposed to falcons with the control group over the period of...
• 13M.3.HL.TZ2.10d: Predict, using the data in the pie charts for weeks 1 to 5 and weeks 6 to 10, if the use of...
• 13M.3.HL.TZ2.11b: The Atlantic cod is considered in many countries to be endangered due to overfishing. Describe...
• 13M.3.SL.TZ2.19a: Identify the primary food for all grasshoppers without predators.
• 13M.3.SL.TZ2.19c: Compare adult feeding to instar larval feeding.
• 13M.3.SL.TZ2.19d: Suggest why adult feeding differs from instar larval feeding when predators are present.
• 09M.1.SL.TZ1.23: Population growth, as shown by the curve below, is the result of changes in mortality, natality,...
• 09M.1.SL.TZ2.22: The diagram below shows a population growth curve. At which time in the population growth...
• 11N.3.HL.TZ0.11c: Outline a method that could be used to sample the plant population shown in photograph B.
• 12N.3.HL.TZ0.10a : State the depth at which the maximum number of species per trawl were caught.
• 12N.3.HL.TZ0.10b (i): Compare the abundance of fish between the early period (1977 to 1989) and the late period (1997...
• 12N.3.HL.TZ0.10b (ii): Suggest one reason for the difference in the abundance of fish at depths down to 2000 m between...
• 12N.3.HL.TZ0.10c: Discuss the evidence in these data for a decline in the biodiversity of fish between the early...
• 12N.3.HL.TZ0.10e: Outline the concept of maximum sustainable yield in the conservation of fish stocks.
• 09N.3.SL.TZ0.20a: Outline one example of herbivory.
• 16M.3.HL.TZ0.18: Evaluate the methods used to estimate populations of marine organisms.
• 16N.3.SL.TZ0.14a: Outline the trend in the number of people with malaria during the period when the use of...
• 16N.3.HL.TZ0.16a: Describe one method that could have been used to estimate the population size of a given tree in...
• 16N.3.HL.TZ0.17a: State two bottom-up factors affecting algal blooms.
• 16N.3.HL.TZ0.17b: Explain how top-down factors control algal blooms.
• 17M.3.HL.TZ1.17: Discuss the factors affecting population growth that can result in an exponential growth curve.
• 17M.3.HL.TZ2.15e: Explain how an excessive growth of algae on coral reefs can be controlled by top-down factors.
• 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...

C.6 Nitrogen and phosphorus cycles

• 15M.3.SL.TZ2.18a: State the role of Rhizobium, Nitrobacter and Azotobacter in the nitrogen cycle. Rhizobium: ...
• 15N.3.SL.TZ0.17b: Outline the process of nitrogen fixation by a named free-living bacterium.
• 15N.3.HL.TZ0.8c: Outline the process of nitrogen fixation by a named free-living bacterium.
• 13M.3.SL.TZ1.18b: Explain the consequences of releasing raw sewage and nitrate fertilizer into rivers.
• 13M.3.SL.TZ2.18a: State one soil condition that favours denitrification.
• 11M.3.HL.TZ1.8b: State the role of Rhizobium and Nitrobacter in the nitrogen cycle.   Rhizobium:      ...
• 11M.3.SL.TZ2.18a: State one condition that favours denitrification.
• 11M.3.SL.TZ2.18b: Explain the consequences of releasing raw sewage and nitrate fertilizer into rivers.
• 12M.3.HL.TZ1.10a (i): Deduce the tank in which the quantity of algae was highest.
• 12M.3.HL.TZ1.10a (ii): Deduce the tank in which the level of mercury accumulation in Daphnia was lowest.
• 12M.3.HL.TZ1.10b: Outline the relationship between phosphorus concentration in the water and the accumulation of...
• 12M.3.HL.TZ1.10c: Using the data, suggest reasons for the relationship between phosphorus concentration in the...
• 12M.3.SL.TZ1.7a: Estimate the difference between the lowest and highest rates of release of CO2 from the soil in...
• 12M.3.SL.TZ1.7b: Suggest one process occurring in tree roots that could cause the release of CO2 from the soil.
• 12M.3.SL.TZ1.7c (i): Describe the relationship between rates of nitrogen addition and release of CO2 from soil in the...
• 12M.3.SL.TZ1.7c (ii): Suggest a reason for this relationship.
• 12M.3.SL.TZ1.7d: Compare the effects of the nitrogen addition treatments on the hardwood and softwood areas of the...
• 12M.3.SL.TZ1.17b: Denitrification is part of the nitrogen cycle. Outline the conditions that favour denitrification...
• 12M.3.SL.TZ2.18c (i): State the role of Rhizobium in the nitrogen cycle.
• 10M.3.SL.TZ1.23a: Indicate the processes occurring at A and B.   A:...
• 10M.3.SL.TZ1.23b (i): Draw an arrow to indicate where in the cycle Azotobacter plays a role.
• 10M.3.SL.TZ1.23b (ii): State the role of Nitrobacter in this cycle.
• 10M.3.SL.TZ1.23c: Outline the consequences of releasing nitrate fertilizer into rivers.
• 11N.3.SL.TZ0.16a: The diagram below shows the nitrogen cycle. Using the letter X, label where the process of...
• 10N.3.HL.TZ0.8a(i): State two nitrogen-fixing bacteria.
• 10N.3.HL.TZ0.8a(ii): Outline the conditions that favour denitrification.
• 16M.3.HL.TZ0.14a: Outline the procedure that was most likely used by the researchers to decide where to take the...
• 16M.3.HL.TZ0.14b: List two sources of the ammonium in the forest soils apart from deposition in rainfall.
• 16M.3.HL.TZ0.14c: Suggest one reason for ammonium levels in the interior of the forest being lower than the soil...
• 16N.3.SL.TZ0.14a: Outline the trend in the number of people with malaria during the period when the use of...
• 16N.3.HL.TZ0.18: Discuss how crop plants obtain the phosphorus that they need to grow and whether the supply of...
• 17M.3.HL.TZ1.16a: Some scientists estimate that available phosphorus reserves in the Earth will be completely...
• 17M.3.HL.TZ1.16b: The percentage of phosphorus in an ecosystem that is recycled per year is in most cases very...
• 17M.3.HL.TZ2.15d: A coat of algae builds up on coral reefs as a consequence of eutrophication. Explain the...
• 17N.3.HL.TZ0.18: Discuss the causes and consequences of eutrophication.