A student says that homeostasis keeps every internal condition completely constant. Which correction is most accurate?
Homeostasis keeps external conditions constant so receptors no longer need to detect stimuli.
Homeostasis regulates internal conditions around optimum levels as internal and external conditions change.
Homeostasis regulates external conditions around fixed levels as cells and organisms remain unchanged.
Homeostasis prevents internal conditions changing by stopping all chemical reactions inside cells.
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.