IB Biology SL 3.3.1 Homeostasis definition Question Bank
Practise IB Biology SL 3.3.1 by defining homeostasis and identifying internal variables controlled within narrow limits.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Define homeostasis as maintaining a stable internal environment within narrow limits.
- Identify blood pH, water balance and blood glucose as homeostatically controlled variables.
D3.3.1—Homeostasis definition question 1
[Maximum number: 4]
Outline what is meant by homeostasis.
maintaining (stable) internal environment/conditions;
b. within (narrow) limits;
c. example (e.g. body temperature / blood pH / blood glucose / water / CO2 concentration);
d. levels of these variables are monitored (internally);
e. negative feedback mechanisms / OWTTE; (reject if positive feedback included)
f. involves hormonal / nervous control;
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