AQA GCSE BIOLOGY HIGHER TIER PAPER 1H
EXAMINATION TEST 2025 COMPLETE
QUESTIONS AND SOLUTIONS ALREADY
PASSED
◉ 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.
- Cornea - transport region.
- Iris - controls the size of the pupil and the amount of light reaching the
retina.
EXAMINATION TEST 2025 COMPLETE
QUESTIONS AND SOLUTIONS ALREADY
PASSED
◉ 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.
- Cornea - transport region.
- Iris - controls the size of the pupil and the amount of light reaching the
retina.
