Which change is an internal stimulus that may be regulated by homeostasis?
A rise in blood glucose concentration after a meal
A rise in room temperature after heating is switched on
A fall in light intensity when a curtain is closed
A rise in sound level when an alarm is activated
40 exam-style questions on AQA GCSE Biology 5.1 Homeostasis, covering 5.1 Homeostasis. Each one has a worked solution and a mark scheme showing where the marks go.