Question
Human gastrulation begins two to three weeks after this event. For 10 points each:
[10e] Name this event in which sperm enters an egg, forming a zygote to begin gestation.
ANSWER: fertilization [prompt on conception]
[10m] Gastrulation organizes this set of three structures. Give the collective name for the endoderm, mesoderm, and ectoderm, which are stratified along the animal–vegetal axis in the amphibian blastocyst.
ANSWER: germ layers
[10h] An early step in amphibian gastrulation is the formation of this structure's dorsal lip from bottle cells. The endoderm and mesoderm internalize via involution through this structure, which forms opposite the site of sperm entry and is analogous to the primitive streak in amniotes.
ANSWER: blastopore [prompt on mouth or anus or cloaca by asking "what structure in the gastrula develops into that structure?"; prompt on archenteron]
<Science - Biology>
Data
Summary
| Tournament | Edition | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|---|
| 2025 PACE NSC | 06/07/2025 | Y | 36 | 11.11 | 92% | 17% | 3% |