1
1 mark
1 markWhat is the total mass of carbon released into the atmosphere from respiration per year?
60 billion tonnes
148 billion tonnes
150 billion tonnes
140 billion tonnes
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Syllabus Edition
First teaching 2023
First exams 2025
|
Tool 3: Mathematics (HL IB Biology)
Exam Questions
51 mins13 questions21 mark
1 markWith reference to the International System of Units, which is the correct unit and symbol for the amount of substance?
kilogram, kg
gram, g
mole, mol
mass, m
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31 mark
1 markA pipette shows a scale with graduations every 0.1 cm3.
What is the uncertainty associated with readings from this pipette?
0.15 cm3
0.01 cm3
0.05 cm3
0.5 cm3
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11 mark
1 markA group of scientists wanted to investigate insulin production in mice. They fed one group of mice with a normal diet and another group with a ‘high fat’ diet (containing a high level of both fat and sugar) for three weeks beforehand. They then measured their blood insulin levels after a meal. Their results are shown in Figure 1 below.
Figure 1. Graph to show insulin production over time in two different groups of mice.
Which of the following conclusions can not be drawn from the data given?
Consuming a 'high-fat' diet leads to a significantly higher peak in blood insulin levels in mice.
Insulin production is faster for the normal diet group in the first 10 minutes after consuming a meal.
Insulin production drops more rapidly for the normal diet group between 30 and 90 minutes after a meal.
Between 30 and 90 minutes after a meal, there is around a 90 % decrease in insulin levels for mice on a 'high-fat' diet.
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21 mark
1 markFruit flies (Drosophila melanogaster) exhibit characteristics governed by the following pairs of alleles.
M = brown body, m = black body
R = red eyes, r = white eyes
These pairs of alleles can be assumed to be unlinked.
If two double-heterozygous flies are crossed and produce 160 offspring, what is the likely number of offspring with red eyes and a black body?
90
120
30
10
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31 mark
1 markThe electron micrograph shows the organelles in a leaf cell. A student uses their ruler to measure the length of the scale bar, which they find to be 1.5 cm.
What is the magnification of the micrograph?
×7000
×7.5
×3000
×300
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41 mark
1 markA chi-squared test was carried out to test for association between species A and species B. The results of the chi-squared test are given below.
Results of chi-squared test:
| Chi-squared value | 5.89 |
| Degrees of freedom | 1 |
Critical values table:
| Degrees of freedom | Probability level | |||
| 0.1 | 0.05 | 0.01 | 0.001 | |
| 1 | 2.71 | 3.84 | 6.64 | 10.83 |
| 2 | 4.60 | 5.99 | 9.21 | 13.82 |
What can be concluded from the chi-squared test for association carried out to test for association between species A and species B?
There is no significant association between species A and species B
Species A competes with species B for resources
There is a statistically significant association between species A and species B at the 5% probability level
There is a statistically significant association between species A and species B at the 1% probability level
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51 mark
1 markWhich of the statements relating to deforestation in the Amazon rainforest is correct?
Only a small area of rainforest is needed to sustain the cycle of transpiration and rainfall that maintains the ecosystem.
A region of rainforest with an area of 4 100 000 km2 was reduced to an area of 3 855 000 km2 over a ten year period, resulting in a percentage decrease of 6 %.
Scientists know the area of rainforest that needs to be maintained in order to avoid passing a tipping point in rainforest stability.
The Amazon rainforest will be able to recover even if deforestation continues until the stability tipping point is reached.
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