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8/11/2019 Diagnostic Evaluation September 2014
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BSQ/IB Diploma Biology
Diagnostic Evaluation
This DIAGNOSTIC EVALUATIONat
the start of the course is designed to assess the potential of the new IB Biology students, and to find out
how each individual in the group can be sufficiently challenged, as well as what are particular targets,
interests or aptitudes. This is achieved by setting assignments in each of the assessment objectives, A,
B, C, D & E. The diagnostic evaluation also focuses upon the scientific process and will show how
well you are able to handle enquiry based learning.
Another most important factor of this Diagnostic Evaluation concerns your cooperation, management
of the time available and the way in which you direct yourself to the tasks and meeting the deadlines.
The rubric on Page 2 will be used to assess your personal commitment to this diagnostic evaluation.
There is 2 weeks work here all to be completed and delivered by Thursday 18thSeptember.
Open up and get to work!
September 2014
John Osborne
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RUBRIC'COMPROMI SO PERSONAL 'in the Diagnostic Evaluation.
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QUESTION 1 (Objective B: Application of Knowledge and Problem Solving)
EVOLUTION
Myxomatosis is a virus disease in rabbits which is transmitted from rabbit to rabbit by rabbit fleas. The virus
causes blindness and then death. 12 rabbits were released in Australia in 1859. They reproduced rapidly and
started to spread quickly, so that by 1886 they were advancing at about 66 miles per year. By 1905 they hadspanned the continent. Rabbit proof fencing was inadequate to halt their progress.
In an attempt to control the huge rabbit population myxomatosis was introduced in 1950. It spread through the
rabbit population resulting in a 99.9% mortality rate. Over the next few years, however, the rabbit population
recovered although not to the pre-myxomatosis numbers. The mortality rate to myxomatosis in rabbits at present
is around 40%.
(a) Suggest two reasons for the rapid spread of rabbits across Australia between 1859 and 1905.
1.................................................................................................................................................................
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2.................................................................................................................................................................
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(b) Suggest two reasons for the very high mortality rate in the rabbit population when myxomatosis was
introduced in 1950.
1.................................................................................................................................................................
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2.................................................................................................................................................................
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(c) With reference to the genetic mechanisms involved; explain the recovery of the rabbit population from the
devastating effects of myxomatosis after its introduction in 1950.
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(d) Suggest why there is still a 40% mortality rate to myxomatosis in present day rabbit populations.
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EVIDENCE FOR EVOLUTION
Only some parts of some animals and plants are fossilised. Usually, when animals and plants die their bodies are
covered by earth and they rot away. The organisms have to be in the right place at the right time to become
fossilised. Over time, the fossils are covered by earth, become compressed and change into rock. Three main
ways that fossils form are:
the body ends up in a place where decay is prevented, e.g. frozen marshes, peat bogs, dry caves
parts of the plant or animal are replaced by other substances as
they decay, e.g. bones, teeth, xylem
hard parts of bodies decay very slowly, e.g. teeth, xylem, hair.
(a) Give one other way in which living organisms may become fossilised.
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(b) Explain why the soft parts of the body are not fossilised.
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EVOLUTION- THE BIG IDEA
Iguanas are land-living reptiles. The adults feed on a variety of land plants whileyounger iguanas feed on
insects. They are found in many parts of the world, andshare features in common with each other. Charles
Darwin studied the iguanason the Galapagos islands and found that there were several different types of
iguanas. It appears that Ctenosaura, the black or spiny-tailed iguana of Central America, is ancestral to
Galapagos iguanas. The Galapagos iguanas feed on different types of food and showed differences in their
adaptations to obtaining food. Land iguanas feed on the fruit and pads of Opuntia cactus. It is not unusualto see
them sitting under a cactus, waiting for pieces to fall. They normally use their front feet to scrape the larger
thorns from the pads, but ignore the smaller thorns. Usually they gulp down a cactus fruit in a few swallows. On
some islands where their usual food was scarce, iguanas adapted to feeding on seaweed. The claws of the sea
iguanas are long and sharp by comparison with the land iguana, to enable them to cling to rocks along the shore,
and resist being pulled away by heavy waves. These claws also enable them to cling totheir underwater feeding
sites. Darwin used these iguanas as examples of evolution occurring by natural selection.
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(a) What is meant by natural selection?
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(b) Explain how natural selection has given rise to different sorts of iguanas.
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(c) Evolution occurs by gradual changes from a common ancestor over long periods. How do these iguanas
provide evidence for evolution?
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(d) Give two reasons why people at the time when Darwin published On the Origin of Species did not accept the
idea of evolution.
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Lamark was a scientist working around the same time as Darwin, and he also developed a theory of evolution.
Lamarkbelieved that offspring inherit characteristics that their parents have acquired as a result of changes that
occur as they struggle to survive.
Darwinbelieved that differences between living organisms occur by chance, and those with the best
characteristics survive to breed, passing on their characteristics.
(e) Present-day giraffes have much longer necks than fossil forms of giraffes.
Describe how:
i) Lamarkstheory could be used to explain this increase in neck length?
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ii) Darwins theory could be used to explain this increase in neck length?
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QUESTION 2 (Objective C: Research and Communication)
This all started when I read the article below. I found the article on the internet when trying to find out something about the
ticks which our dog picked up on the coast, during a holiday last year. Read the article below (from the BBC) and also the
support information following, about the immune system and mast cells. Do your best to understand it all and then make
the research which is outlined at the end, on Page 7.
Obscure Immune Cells Thwart Ticksby Mitch Leslie on 26 July 2010
Resistance isnt futile.Immune cells called basophils help prevent ticks from drinking their
fill of blood.
Credit: Thinkstock
Rare in the body and hard to study, immune cells called basophils have long gotten short shrift from researchers.
But a study now shows that basophils help repel bloodthirsty ticks that can spread lethal diseases. The work also
introduces a new method for teasing out further immune functions of the often-overlooked cells.
Many animals develop some resistance to ticks the first time the parasites feast on their blood. During later
feedings, fewer ticks latch on to resistant animals, and parasites that do attach sup less blood and sometimes
even die. Resistance provides another benefit, reducing the odds that ticks will transmit pathogens to their hosts.
Some evidence indicated that basophils play a role in tick resistance, but other research pointed to different cells
called mast cells. So identifying the key protector has been difficult.
In the new work, immunologist Hajime Karasuyama of the Tokyo Medical and Dental University GraduateSchool in Japan and colleagues tracked basophils in mice troubled by ticks. When animals were first attacked by
the parasites, the cells rarely homed in on tick bites. But if the animals were on their second infestation, the
basophils, which normally circulate in the blood, swarmed to the bites and huddled around the parasites' mouth
parts. The team then experimented with two ways to temporarily remove the cells from a mouse's circulation.
First, the researchers used an established method, injecting mice with antibodies that glom onto basophils. Tick
resistance disappeared in these rodents. These antibodies, however, also eliminate mast cells, which made it
impossible to determine which cells were providing the benefit. To target basophils, the researchers devised a
new technique: they genetically engineered mice so that their basophils carried a receptor for the toxin produced
by the diphtheria bacterium. Giving such a mouse a dose of diphtheria toxin destroys the animal's basophils for
5 to 6 daysand banishes resistance to ticks, the scientists report in TheJournal of Clinical Investigation .
"Now, we know that the basophil is quite important to acquired tick resistance," says Karasuyama.
Mast cells are also essential for tick resistance, the researchers showed. The team suggests that basophils are
necessary to trigger the response, whereas both kinds of cells help turn away ticks. Whether mast cells and
basophils collaborate or operate independently to foil the parasites is still a mystery. The tick work is part of a
surge of new research on basophils, some of it suggesting that they orchestrate immune responses to parasitic
worms and raise the alarm during bacterial infections. The lack of a method for selectively eliminating
basophils, leaving mast cells intact, had slowed studies of their functions. But immunologist Donald
MacGlashan of Johns Hopkins University School of Medicine in Baltimore, Maryland, says the genetically
modified mice created by Karasuyama's team are a "fabulous tool" to probe what else these elusive cells do inthe body.
http://news.sciencemag.org/sciencenow/2010/07/obscure-immune-cells-thwart-tick.html
http://news.sciencemag.org/sciencenow/2010/07/obscure-immune-cells-thwart-tick.htmlhttp://news.sciencemag.org/sciencenow/2010/07/obscure-immune-cells-thwart-tick.htmlhttp://news.sciencemag.org/sciencenow/assets_c/2010/07/sn-ticks-thumb-autox600-3917.jpghttp://news.sciencemag.org/sciencenow/2010/07/obscure-immune-cells-thwart-tick.html8/11/2019 Diagnostic Evaluation September 2014
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The Immune System:Information about Lymphocytes, Dendritic Cells, Macrophages, and White Blood Cells
The Immune system is a complex network of cells (such as lymphocytes) and organs that work together to
defend the body against foreign substances (antigens) such as bacteria, a virus or tumour cell. When the body
discovers such a substance several kinds of cells go into action in what is called an immune response. Below is
a description of some of the cells that are part of the immune system.
Lymphocytes
Lymphocytes are one of the main types of immune cells. Lymphocytes are divided mainly into B and T cells.
B lymphocytesproduce antibodies - proteins (gamma globulins) that recognize foreign substances (antigen) and
attach themselves to them. B lymphocytes (or B cells) are each programmed to make one specific antibody.
When a B cell comes across its triggering antigen it gives rise to many large cells known as plasma cells. Each
plasma cell is essentially a factory for producing antibody. An antibody matches an antigen much like a key
matches a lock. Whenever the antibody and antigen interlock, the antibody marks the antigen for destruction. B
lymphocytes are powerless to penetrate the cell so the job of attacking these target cells is left to T
lymphocytes.
T lymphocytesare cells that are programmed to recognize, respond to and remember antigens. T lymphocytes
(or T cells) contribute to the immune defences in two major ways. Some direct and regulate the immune
responses. When stimulated by the antigenic material presented by the macrophages, the T cells make
lymphokines that signal other cells. Other T lymphocytes are able to destroy targeted cells on direct contact.
Macrophages
Macrophages are the body's first line of defence and have many roles. A macrophage is the first cell to
recognize and engulf foreign substances (antigens). Macrophages break down these substances and present the
smaller proteins to the T lymphocytes. (T cells are programmed to recognize, respond to and remember
antigens). Macrophages also produce substances called cytokines that help to regulate the activity oflymphocytes.
Dendriti c Cell s
Dendritic cells are known as the most efficient antigen-presenting cell type with the ability to interact with T
cells and initiate an immune response. Dendritic cells are receiving increasing scientific and clinical interest
due to their key role in the immune response and potential use with tumour vaccines.
Whi te Blood Cell s
There are different types of white blood cells that are part of the immune response. Neutrophils or granulocytes
are the most common immune cells in the body. With an infection, their number increases rapidly. They arethe major components of pus and are found around most common inflammations. Their job is to eat and destroy
foreign material. Basophils and eosinophils are white blood cells that contain large granules inside the cell.
They interact with certain foreign materials. Their increased activity may lead to an allergic reaction.
The immune response is a coordinated effort. All of the immune cells work together, so they need to
communicate with each other. They do this by secreting increased levels of a special protein molecule called
cytokines that act on other cells. There are many different cytokines. Examples of these are interleukins,
interferons, tumour necrosis factors, and colony-stimulating factors. Someimmunotherapy treatment strategies
involve giving larger amounts of these proteins by an injection or infusion. This is done in the hope of
stimulating the cells of the immune system to act more effectively or to make the tumour cells more
recognizable to the immune system.
http://www.chemocare.com/whatis/the_immune_system.asp
http://www.chemocare.com/whatis/fullstory_iNewsid_128598.htmhttp://www.chemocare.com/whatis/the_immune_system.asphttp://www.chemocare.com/whatis/the_immune_system.asphttp://www.chemocare.com/whatis/the_immune_system.asphttp://www.chemocare.com/whatis/fullstory_iNewsid_128598.htm8/11/2019 Diagnostic Evaluation September 2014
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MAST CELLA granular cell found in body tissue, especially connectivetissue, that activates inflammation by releasing a variety ofchemical substances including heparin, histamine, serotonin,tumour necrosis factor, and interleukins. Mast cells havemembrane receptors that bind to bacteria, triggering the
release of inflammatory mediators from the mast cell'scytoplasmic granules. Mast cells also play an important rolein allergic reactions. Other receptors on their membranesbind to specific antibodies that, combined with certainantigens, initiate granular release of chemical mediators thatcause allergic signs and symptoms.
THE ASSIGNMENT
These articles and information pages about immunity throw up so many ideas, unknowns and questions of
interest which demand further research. The knowledge which you and I presently have cannot handle all of this
and there are things which need following up. So here you go ......
a) Contrive a QUESTIONabout any aspect of what you have read above, a question that you would like
to answer. (You have great flexibility in deciding upon your question. ANYaspect of what you have
read will do, but check with me first.)
b) Set about RESEARCHINGthe answer to the question. The research could be from books or from
talking with experts, but is more likely to come from the internet. You research should be collected
together in some waymaybe a directory or file which you can share with me through Google Docs, ora small file of notes.
c) PRESENTthe research (your answer to the question) in whatever form you think is most appropriate.
Your audience will be the other Year 12 Biologists. This presentation could be a poster, a model, a
powerpoint, a research paper. I would like you to be as creative as possible. You will also have to
discuss your findings and answer questions.
d) Construct a short TEST or QUIZ which your audience will have to complete. This test/quiz will be the
EVALUATIONof how well you have answered your question and communicated your new
knowledge.
An example of how this might be achieved:a) QUESTION: How does a tick feed on the blood of a mammal?
b) RESEARCH: There are lots of lines of research, including tick mouth parts, anti-clotting
agents which ticks use, mammals which are the hosts for ticks, frequency of blood feeding, etc.
c) PRESENTATION: A labelled model of the head of a tick and its mouth parts, and an annotated
poster describing how the tick uses its mouth parts to penetrate the skin of a mammal and suck
blood.
d) TEST: A simple recall of the main ideas, including a labelled drawing.
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QUESTION 3 (Objective D: Evaluation of Data and Evidence and Making Conclusions)
Answer this data evaluation question.
HUMMING BIRDS
Hummingbirds have long narrow beaks that adapt them to collecting nectar from flowers. Nectar provides
energy in the form of sugar, but has very low concentrations of amino acids and protein. Therefore,hummingbirds have to supplement their diet by catching flying insects. They do this by flying with theirbeaks wide open towards insects. Scientists have used high-speed video to study the success rate for
catching insects. The pie charts below show the results, according to which part of the beak the insecttouches first.
[Source: Reprinted with permission from Macmillan Publishers Ltd: Gregor M. Yanega and Margaret A. Rubega, Feedingmechanisms :Hummingbird jaw bends to aid insect capture,Nature(2004), vol. 428, p. 615, 2004]
(a) (i) State the relationship between the part of the beak that insects first touch and the
success rate.
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.........................................................................................................................(1)
(ii) Suggest a reason for the relationship in (a) (i).
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Birds that feed only on flying insects have a different shape of beak from hummingbirds.
(b) Predict, with a reason, the shape of beak in a species of bird that feeds only on flying insects.
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Key:
Insect successfully
caught and swallowed
Insect lost
17%
83%
44%
56%65%
35%
Base of beak Middle of beak Tip of beak
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Very rapid wing beats keep a hummingbirds body steady near a flower while it collects nectar. Thisunusual type of flight behaviour is called hovering. Measurements were taken to investigate hovering infour hummingbird species. The body mass and maximum frequency of wing beats were measured. Thevelocity of the wing tips was measured when the wings were beating at their maximum frequency. Themean results are shown in the table below.
Hummingbird species
VariableBlue-throated(Lampornisclemenciae)
Magnificent(Eugenesfulgens)
Black-chinned(Archilochusalexandri)
Rufous(Selasphorus
rufus)
Body mass / g 8.40 7.40 3.00 3.30
Maximum frequency of wingbeats per second
30.70 31.90 59.70 62.20
Velocity of wing tips / m s1 16.80 16.50 15.80 16.90
[Source: Chai, 1997,Journal of Experimental Biology, 200, pages 27572763]
(c) State the relationship between body mass and maximum frequency of wing beats.
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The data in the table indicates that there is a similar maximum velocity for wing tip movement whateverthe overall size of the bird.
(d) Suggest oneproblem that would be caused by a velocity of wing tip movement greater thanthis.
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Hummingbirds are the smallest birds in the world, with adult masses ranging from approximately 2 g to20 g.
(e) Using the data in the table, suggest a reason why hummingbirds with a mass larger than 20 ghave not evolved.
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Hummingbirds maintain constant internal body temperature despite variation in external temperature. Theeffect of external temperature on Annas hummingbird (Calypte anna) was studied in a series of
experiments. At 40C the hummingbirds were observed to rest after short flights and ventilate their lungs
rapidly to cool their bodies by evaporation of water (panting).
The hummingbirds were placed in different external temperatures and a dilute solution of sucrose was
given to them. Between 20C and 40C the volume of sucrose solution taken in per hour did not vary
significantly and was 0.70.8 cm3. At 10C the volume was significantly higher at 1.2 cm3per hour.
(f) Explain why the volume taken in per hour was higher at 10C than at the highertemperatures.
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Urine was collected from the hummingbirds at the three different external temperatures and wasanalysed to find the concentrations of nitrogenous waste products. The results are shown in the barchart below.
(g) Suggest onereason for the higher overall concentration of nitrogenous waste products in
urine at 40C.
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Concentration /
mol dm3
9
8
7
6
5
4
3
2
1
0
Key:
ammonia
urea
uric acid
10 20 40
Temperature / C
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The ratio between the concentration of ammonia and the concentration of uric acid in the urine of
hummingbirds changes as the temperature rises. The ratio at 10C is 4.4 :1.
(h) (i) Calculate the ratio between the concentration of ammonia and the concentration of
uric acid at 40C.
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(ii) Explain the difference in the relative amounts of ammonia and uric acid at 10C and at
40C.
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Hummingbirds use energy at a faster rate than any other bird or mammal.
(i) Explain tworeasons for the high rate of energy use in hummingbirds.
1. .........................................................................................................................
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2. .........................................................................................................................
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(Total 15 marks)
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QUESTION 4 (Objective E: Experimental Investigation. Group work)
Complete this investigation with a partner and answer the assignment questions below.
A METHOD FOR MEASURING THE DENSITY OF MILK: COPPER PROTEINATE FORMATION
A method is described below for determining the relative density of protein-containing fluids, such as milk or
blood. Measurements are made to determine the rate at which drops of milk, or milk-water mixtures, fall under
gravity through a copper(ii) sulphate solution. A layer of copper proteinate forms around each drop, preventing
dispersal of the milk.
Method
1 Pour the solution of copper(ii) sulphate into the two measuring cylinders, filling each one to a depth
approximately 5 cm3 above the 100 cm3level.
2 Introduce some undiluted milk into the 1 cm3syringe, fitted with the long needle.
3 Place the tip of the needle just below the surface of the copper(ii) sulphate solution.
4 Gently press the plunger of the syringe to release a small drop of milk.
5 Record the time taken for the drop to fall between the 100 cm3and 10 cm3marks of the measuring
cylinder.6 Repeat this procedure using the second measuring cylinder.
7 Obtain the times taken for 3 drops to fall and calculate a mean value. (Data collection and processing)
8 Make dilutions of the milk containing, respectively, 5, 10, 20, 30, 40, 50 and 60% milk by volume.
Repeat the procedure above with each milk-water sample.
The assignment tasks are below. These should be printed from the computer onto A4 paper,. This work must be
shared with me (Google Docs) so that it can be saved for your IB Practical Portfolio. Although you complete
this investigation with a partner, the assignment tasks must be your alone.
Data collection and processing
Record the time taken for three drops of each mixture to fall between the 100 cm3 and 10 cm3marks, and
calculate mean values. Record the results in the form of the most suitable table.
In what proportion must milk and water be mixed to have a density equivalent to the density of 0.1 M
copper(ii) sulphate solution? Explain how you arrived at your answer.
Plot all the results as a graph.
Conclusion and evaluation What can you conclude from this investigation? Explain how you justify your conclusion.
State the chief source(s) of error in this investigation and explain how it/they could be overcome.
Materials
100 cm3fresh milk
100 cm3distilled water
250 cm30.1 copper(ii) sulphate solution
two 10 cm3plastic syringes
1 cm3plastic syringe fitted with a long needle
two 100 cm3measuring cylinders
stop watch