Practice IB Biology Topic D3.1 Reproduction with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for D3.1 Reproduction and mirrors Paper 1A, 1B, 2 style where relevant.
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Equal-sized populations reproduced once, then encountered a new fungal strain. Which conclusion is supported?
| Offspring | Genotypes present | Survival in original environment / % | Survival with new fungus / % |
|---|---|---|---|
| asexual clones | 1 | 92 | 18 |
| sexual offspring | 14 | 76 | 62 |
…
Gametes contain four chromosomes; zygotes contain eight. Gamete allele combinations vary.
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A botanical study identifies the following traits in a species of wild grass:
| Trait | Observation |
|---|---|
| Stamens | Long filaments that swing freely in the breeze |
| Stigma | Branched and net-like with a large surface area |
| Nectar | Absent |
Which pollination strategy is most likely used by this grass species?
The image shows the layout and mechanism of a pregnancy test strip.
What is the most likely reason a test result displays only the control line but no test line, even though urine was applied?
Which statement correctly describes step D in the diagram?
Animal-assisted pollination
Wind-driven pollination
Self-pollination within closed flowers
Insect pollination with nectar reward
The test strip is faulty and contains no monoclonal antibodies at the test line.
The urine did not reach the test line due to a blocked membrane.
The concentration of hCG in the urine was too low to bind to the test line antibodies.
The woman is not pregnant and thus no hCG was present to trigger the test line.
Completion of meiosis I forming the first polar body (and a secondary oocyte).
Completion of meiosis II after fertilization, forming a haploid ovum and second polar body.
First meiotic division producing two equal daughter cells, each capable of fertilization.
Asymmetric division after mitosis, producing a polar body and a functional diploid ovum.
