AQA GCSE Combined Science: Trilogy Higher – Physics Paper 2H
Mark Scheme
Topic: Biology – Homeostasis, Hormones, Genetics, Reproduction,
Evolution
1. Homeostasis and Control Systems
1. What is homeostasis?
The process of maintaining a stable internal environment.
2. Why is homeostasis important?
It is essential for the survival of cells.
3. What does the control system do?
Keeps the conditions in your body steady.
4. What happens if blood glucose level is too high?
The control system decreases the level.
5. What happens if blood glucose level is too low?
The control system increases the level.
2. The Nervous System
6. What does the nervous system do?
Humans react to their surroundings and coordinate their behaviour.
7. What does the Central Nervous System (CNS) consist of?
Brain and spinal cord.
8. What is the CNS connected to?
The body via sensory neurones and motor neurones.
9. What do sensory neurones do?
Carry information as electrical impulses from receptors to the CNS.
10. What do motor neurones do?
Carry electrical impulses from the CNS to effectors.
11. What are receptors?
Cells that detect stimuli.
, 12. Example of a receptor:
Receptors in the ear detect sound.
13. What do effectors respond to?
Electrical impulses to bring about change.
14. Examples of effectors:
Muscles and glands.
15. CNS process pathway:
Stimulus → Receptor → Sensory Neurone → CNS → Motor Neurone →
Effector → Response.
16. What is a synapse?
The junction where two neurones meet.
17. What are reflexes?
Automatic responses to prevent injury.
3. Hormonal Coordination
18. What are hormones?
Chemical messengers sent in the blood.
19. Another name for Pituitary Gland:
Master gland.
20. What does the Pituitary Gland produce?
Many hormones that regulate body conditions.
21. What do ovaries produce?
Oestrogen.
22. What is oestrogen involved in?
Menstrual cycle.
23. What do testes produce?
Testosterone.
24. Testosterone controls:
Puberty and sperm production in men.
25. What does the thyroid produce?
Thyroxine.
Mark Scheme
Topic: Biology – Homeostasis, Hormones, Genetics, Reproduction,
Evolution
1. Homeostasis and Control Systems
1. What is homeostasis?
The process of maintaining a stable internal environment.
2. Why is homeostasis important?
It is essential for the survival of cells.
3. What does the control system do?
Keeps the conditions in your body steady.
4. What happens if blood glucose level is too high?
The control system decreases the level.
5. What happens if blood glucose level is too low?
The control system increases the level.
2. The Nervous System
6. What does the nervous system do?
Humans react to their surroundings and coordinate their behaviour.
7. What does the Central Nervous System (CNS) consist of?
Brain and spinal cord.
8. What is the CNS connected to?
The body via sensory neurones and motor neurones.
9. What do sensory neurones do?
Carry information as electrical impulses from receptors to the CNS.
10. What do motor neurones do?
Carry electrical impulses from the CNS to effectors.
11. What are receptors?
Cells that detect stimuli.
, 12. Example of a receptor:
Receptors in the ear detect sound.
13. What do effectors respond to?
Electrical impulses to bring about change.
14. Examples of effectors:
Muscles and glands.
15. CNS process pathway:
Stimulus → Receptor → Sensory Neurone → CNS → Motor Neurone →
Effector → Response.
16. What is a synapse?
The junction where two neurones meet.
17. What are reflexes?
Automatic responses to prevent injury.
3. Hormonal Coordination
18. What are hormones?
Chemical messengers sent in the blood.
19. Another name for Pituitary Gland:
Master gland.
20. What does the Pituitary Gland produce?
Many hormones that regulate body conditions.
21. What do ovaries produce?
Oestrogen.
22. What is oestrogen involved in?
Menstrual cycle.
23. What do testes produce?
Testosterone.
24. Testosterone controls:
Puberty and sperm production in men.
25. What does the thyroid produce?
Thyroxine.
