Zadanie 1b
A student prepares stained squash mounts from a young garlic root to examine cell division. (i) Outline why a stain is used. (ii) Describe how to calculate a reliable mitotic index for the tissue.
Cell and nuclear division
Umiejętności w tym dziale
Umiejętności z tego działu sprawdza 48 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 31 z 54 arkuszy w bazie.
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Zadanie 1c
In a model tumour-culture experiment, comparable tissue samples are randomly allocated to four treatments: neither compound, P alone, Q alone, or P with Q. After the same incubation period, mitotic indices are measured. Error bars represent standard…
- Materiał graficzny
Zadanie 4a
A root meristem sample contains 240 cells. Its mitotic index is 0.30. Calculate how many of these cells are undergoing mitosis.
Zadanie 4b
Distinguish between the final cellular products of mitosis and meiosis in a diploid flowering plant.
Zadanie 4c
Foxgloves are hermaphroditic flowering plants. Discuss how these plants can generate genetically varied offspring.
Zadanie 8
Sexual life cycles can produce new combinations of inherited traits. (a) Draw and label a section of an insect-pollinated flower, indicating the structures associated with male and female gamete production. (b) Explain the sources of variation arising through…
Zadanie 19
Which event is shared by mitotic and meiotic nuclear division? A. Homologous chromosomes must pair as bivalents in both B. The chromosome number is halved in both C. Chromatin becomes more condensed through DNA packaging with histones D. DNA is replicated…
Zadanie 20
A developing animal cell divides its cytoplasm very unevenly, leaving almost all of it in one product. Which process normally includes this pattern? A. Production of two equivalent daughter skin cells B. Binary fission of an intestinal bacterium C. Formation…
Zadanie 40
Which event creates different combinations of maternal and paternal chromosomes among gametes? A. Copying a chromosome before an ordinary mitotic division B. Equal partition of cytoplasm in a skin cell C. Independent orientation of homologous chromosome pairs…
Zadanie 8
A student compares flowering plants with mammals and examines their ecological interactions. (a) Distinguish the cellular structures typical of these groups. (b) Outline adaptations that allow animals to feed on plants and adaptations that defend plants from…