D3.1.5—Ovarian and uterine cycles Topic Practice
D3.1.5—Ovarian and uterine cycles Topic Practice

IB Biology syllabusBiology SL/HLFirst assessment 2025
Practise hormone feedback in ovarian and uterine cycles, including graph interpretation, ovulation timing and links between FSH, LH, estrogen and progesterone.
How this is tested
- interpret hormone graphs to match FSH, LH, estrogen or progesterone with cycle events
- explain feedback between follicle hormones and pituitary secretion during the cycle
- link LH surge and progesterone changes to ovulation and the post-ovulation phase
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