Zadanie 5c
Explain how competition within a species contributes to natural selection.
Relative fitness and reproductive success
Explain how differences in adaptation influence survival and the contribution of alleles to future generations.
Tę umiejętność sprawdza 28 zadań wzorowanych na arkuszach IB z lat 2022–2026.
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Zadanie 2b
Repeated drought changes conditions in the beetles’ habitat. Explain how environmental change can alter natural selection.
Zadanie 6
Nectar-feeding insects depend on flowering plants and can influence their evolution. (a) Outline links between the properties of glucose and its uses. (b) List human activities that threaten insect pollinators. (c) Explain how natural selection can produce…
Zadanie 7
Changes in genetic material can have different consequences. (a) Outline how mutations can contribute to cancer. (b) Outline one human disease caused by an autosomal recessive allele. (c) Explain the role of mutation in evolution. One additional mark is…
Zadanie 3
A bacterial population becomes less susceptible to an antibiotic after many generations of exposure. (i) State two structural features distinguishing a typical bacterial cell from a typical eukaryotic cell. (ii) Explain how resistance can become common in this…
Zadanie 5c
A hypothetical comparison includes thirteen placental mammal species. Species I-M are primates. Suggest two reasons for the lower counts in the primate group.
- Materiał graficzny
Zadanie 7
(a) Describe the role of mRNA in polypeptide synthesis. (b) Describe why haemophilia is more frequent in males than females. (c) Explain how changes in chromosomes can contribute to evolution.
Zadanie 8
A hypothetical crop tolerates herbicide J. The model survey records weed species resistant to J. Suggest environmental problems that could result from the trend.
- Materiał graficzny
Zadanie 9a
A hypothetical crop is engineered to resist herbicide H. H kills susceptible weeds and is readily broken down by soil microorganisms. Explain two advantages of growing the resistant crop.
Zadanie 9b
A hypothetical crop is engineered to resist herbicide H. H kills susceptible weeds and is readily broken down by soil microorganisms. A model survey follows adoption of the resistance trait in two crops. (i) Identify the first year in which the percentage for…
- Materiał graficzny
Zadanie 21
Two descendant bird lineages evolve different feeding structures. Which statements can explain this divergence? I. Heritable beak variation was available in the ancestral population. II. Beak wear acquired by an individual is necessarily inherited by its…
- Materiał graficzny
Zadanie 1i
Evaluate the claim that natural selection may favour competition in some circumstances.
- Materiał graficzny
Zadanie 6
A health study considers sickle-cell anaemia in a malaria-endemic region of Uganda. Individuals with two sickle-cell alleles may develop severe anaemia; heterozygotes generally lack that severe phenotype and have some protection against malaria. (a) Outline…
Zadanie 7
Bacterial cells express genetic information, and inherited variation can affect survival during antibiotic treatment. (a) Draw and label a single RNA nucleotide. (b) Explain how RNA enables a polypeptide to be assembled during translation. (c) Outline how…
Zadanie 5d
Suggest how the frequency of spotted individuals could change in the population.
Zadanie 11b
In a model region, cultivation of herbicide-resistant crops expanded during the period shown. The chart records the cumulative number of weed species reported resistant to that herbicide. Comment on environmental consequences of widespread use of these crops.
- Materiał graficzny
Zadanie 21
A heritable variant that permits adult digestion of a particular dietary sugar becomes more frequent over many generations after that food becomes common. Which explanation is consistent with evolution? A. Eating the food directs every individual to produce…
Zadanie 23
In a stable environment, a heritable trait lowers survival and the number of offspring produced. What does natural selection tend to do over generations? A. Decrease the trait’s frequency B. Ensure that every individual acquires a beneficial mutation C. Pass…
Zadanie 7
(a) Describe how increasing atmospheric carbon dioxide can change coral reef ecosystems. (b) Explain how natural selection changes a population.
Zadanie 7
(a) Outline changes to atmospheric composition that living organisms have caused. (b) Explain how natural selection changes a population. (c) Explain how ventilation changes pressure inside the lungs.
Zadanie 9a
In a hypothetical region, crops resistant to a herbicide H are introduced during the survey period. The graph shows subsequent use and confirmed resistant-weed records. Suggest one reason for the increasing occurrence of resistant weeds.
- Materiał graficzny
Zadanie 9
A constructed survey follows weeds resistant to herbicide H after resistant crops become widely used. The chart gives cumulative confirmed species counts. (i) Identify the year with the greatest number of newly recorded resistant species across all regions.…
- Materiał graficzny
Zadanie 22
Which observation is a possible consequence of natural selection over several generations? A. Environmental change creates variation only after reproduction stops B. All produced offspring necessarily survive to breed C. A heritable trait becomes less frequent…
Zadanie 22
Which observation is a possible consequence of natural selection over several generations? A. Environmental change creates variation only after reproduction stops B. All produced offspring necessarily survive to breed C. A heritable trait becomes less frequent…
Zadanie 7
Inheritance and cell division contribute to biological variation. (a) Draw and label one RNA nucleotide. (b) Distinguish mitosis from meiosis. (c) Explain how natural selection can produce antibiotic resistance in a bacterial population.
Zadanie 7
Water availability can influence which plants survive in a community. (a) Outline energy flow through a natural community. (b) Explain how natural selection can increase drought resistance in a wild plant population.
Zadanie 20
A constructed survey finds that pale moths become more frequent after soot deposits on tree bark decline. Which explanation is consistent with natural selection? A. Every dark moth changes its inherited colour in response to cleaner air B. Pale moths become…
Zadanie 21
In a hypothetical island survey, two seed-eating bird populations are recorded alongside an insect-eating population. Which explanation could account for the restricted distribution of the thick-beaked population? Population | Island P | Island Q | Island R |…