Biology · Paper 2 · Foundation + Higher · B5
At puberty, reproductive hormones cause secondary sex characteristics to develop. Oestrogen is produced mainly by the ovaries. Testosterone is produced by the testes and stimulates sperm production. Eggs begin to mature in the ovaries during puberty.
No timer. Read the explanation after each answer.
Daily 5 · Exam practice · Revision sheet ↓
Foundation + Higher · B5. Nine core lessons, followed by four labelled Higher Tier lessons.
AQA Combined Science Trilogy 8464 · 4.5.3.3. Original notes, questions and diagrams. Models are simplified; teaching data are illustrative.