GCSE BIOLOGY HIGHER TIER PAPER 1H
REVISION PRACTICE QUESTIONS AND MODEL
ANSWERS 2026
◉ Negative Feedback. Answer: This is a type of control mechanism:
1) a receptor detects a change in a stimulus.
2) the coordination centre compares the stimulus to a set point.
3) an effector then produces a response to correct any difference
from the set point.
◉ The Thermoregulatory Centre. Answer: This is in the brain and it
monitors and controls body temperature, blood temperature via
impulses from temperature receptors.
◉ Effects when Body Temperature is too High. Answer: -
Vasodilation.
- Swear more.
- Transfer of energy form the skin to the environment.
◉ Effects when Body Temperature is too Low. Answer: -
Vasoconstriction
- Stop sweating
,- Piloerection
- Shiver
◉ The Nervous System. Answer: This enables humans to react to
their surroundings and coordinate their behaviour. It stimulates a
reflex arc.
◉ Types of Neurones. Answer: Sensory Neurone, Motor Neurone,
Relay Neurone.
◉ Reflex Arc. Answer: 1) the pain stimulus is detected by receptors.
2) impulses from the receptor pass along a sensory Neurone to the
CNS.
3) an impulse then passed through a relay Neurone.
4) a motor neurone carries an impulse to the effector.
5) the effector (muscle or gland) responds
◉ Synapse. Answer: The connection between neurones. When an
electrical impulse reaches this, a chemical is released that diffused
across the gap. This causes an electrical impulse to be generated in
the second one.
◉ Human Reaction Time Required Practical. Answer: 1) the
experimenter holds a meter rule from the end.
, 2) the subject had their finger and thumb a small distant apart either
side of the ruler on the 50cm line.
3) the experimenter lets go of the ruler and the subject has to trap it.
4) the distance the ruler travels from the 50cm line is noted.
5) the experiment is repeated on the subjects that have just drunk
coffee and the subjects that have not.
◉ Parts of the brain. Answer: - Medulla
- Cerebellum
- Cerebral Cortex
◉ Medulla. Answer: controls automatic actions such as heartbeat
and breathing.
◉ Cerebellum. Answer: coordinates movement and balance
◉ cerebral cortex. Answer: responsible for consciousness,
intelligence, memory and language.
◉ Parts and Functions of the Eye. Answer: - Retina - contains
receptor cells that are sensitive to brightness and colour of light.
- Optic Nerve - carries impulses from the retina to the brain.
- Sclera - forms a tough outer layer.
REVISION PRACTICE QUESTIONS AND MODEL
ANSWERS 2026
◉ Negative Feedback. Answer: This is a type of control mechanism:
1) a receptor detects a change in a stimulus.
2) the coordination centre compares the stimulus to a set point.
3) an effector then produces a response to correct any difference
from the set point.
◉ The Thermoregulatory Centre. Answer: This is in the brain and it
monitors and controls body temperature, blood temperature via
impulses from temperature receptors.
◉ Effects when Body Temperature is too High. Answer: -
Vasodilation.
- Swear more.
- Transfer of energy form the skin to the environment.
◉ Effects when Body Temperature is too Low. Answer: -
Vasoconstriction
- Stop sweating
,- Piloerection
- Shiver
◉ The Nervous System. Answer: This enables humans to react to
their surroundings and coordinate their behaviour. It stimulates a
reflex arc.
◉ Types of Neurones. Answer: Sensory Neurone, Motor Neurone,
Relay Neurone.
◉ Reflex Arc. Answer: 1) the pain stimulus is detected by receptors.
2) impulses from the receptor pass along a sensory Neurone to the
CNS.
3) an impulse then passed through a relay Neurone.
4) a motor neurone carries an impulse to the effector.
5) the effector (muscle or gland) responds
◉ Synapse. Answer: The connection between neurones. When an
electrical impulse reaches this, a chemical is released that diffused
across the gap. This causes an electrical impulse to be generated in
the second one.
◉ Human Reaction Time Required Practical. Answer: 1) the
experimenter holds a meter rule from the end.
, 2) the subject had their finger and thumb a small distant apart either
side of the ruler on the 50cm line.
3) the experimenter lets go of the ruler and the subject has to trap it.
4) the distance the ruler travels from the 50cm line is noted.
5) the experiment is repeated on the subjects that have just drunk
coffee and the subjects that have not.
◉ Parts of the brain. Answer: - Medulla
- Cerebellum
- Cerebral Cortex
◉ Medulla. Answer: controls automatic actions such as heartbeat
and breathing.
◉ Cerebellum. Answer: coordinates movement and balance
◉ cerebral cortex. Answer: responsible for consciousness,
intelligence, memory and language.
◉ Parts and Functions of the Eye. Answer: - Retina - contains
receptor cells that are sensitive to brightness and colour of light.
- Optic Nerve - carries impulses from the retina to the brain.
- Sclera - forms a tough outer layer.
