Practice IB Biology Topic D - Continuity and Change with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for D - Continuity and Change and mirrors Paper 1A, 1B, 2 style where relevant.
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An animal cell contains 0.30 mmol impermeant solute. Its volume changes as shown. Which description is supported?
Seedling lineages differ in drought recovery and maternal moisture history. Which comparison best tests whether their recovery difference is inherited?
| Stage | Medium | Cell volume / cm³ | Result |
|---|
| Initial | — | 1.00 | intact |
| Equilibrium | X | 0.75 | intact |
| After transfer | Y | — | lysis |
After equilibrating at 0.40 mol dm⁻³, a cylinder enters the isotonic solution for untreated tissue. Which concentration and initial change follow?
What is the purpose of meiosis in eukaryotic organisms?
Hypothalamic pathways P and Q were separately blocked during heating. Which roles are supported by the graph?
X: 0.40 mol dm⁻³; Y: hypotonic
X: 0.225 mol dm⁻³; Y: hypertonic
X: 0.40 mol dm⁻³; Y: isotonic
X: 0.225 mol dm⁻³; Y: hypotonic
Grow their first offspring in identical conditions, then compare recovery after identical drought.
Select equally sized seeds from both mothers, then compare seedling recovery after identical drought.
Raise both lineages for two watered generations, then compare recovery after each reaches equal wilting.
Raise both lineages for two watered generations, then compare recovery after identical drought.
0.30 mol dm⁻³; mass loss
0.40 mol dm⁻³; no mass change
About 0.33 mol dm⁻³; mass gain
About 0.33 mol dm⁻³; mass loss
Producing two identical nuclei
Producing haploid nuclei for sexual reproduction
Replicating chloroplast DNA
Allowing asexual reproduction in prokaryotes
P promotes skin vasodilation; Q promotes sweating.
P promotes sweating; Q promotes skin vasodilation.
Both pathways promote skin vasoconstriction during heating.
Both pathways inhibit skin blood flow and sweating.
