AQA GCSE COMBINED SCIENCE BIOLOGY
PAPER 2F 8464/B/2F TESTED REVISION PAPER
2026 QUESTIONS AND SOLUTIONS
◉ Evaluate the benefits and risks of procedures carried out on the
brain and the nervous system. Answer: +ve- Can lead to the
treatment for disorders of the nervous system
-ve- The brain is complex and delicate. The treatment of brain
damage is difficult. It also carries risks such as physical damage or
increased problems with brain damage e.g. speech.
NB: ADD A CONCLUSION.
◉ What is reaction time? Answer: The time it takes to respond to a
stimulus
◉ What is reaction time affected by? Answer: Age, drugs e.g. caffeine
or gender
◉ Why are computers a better way of measuring reaction time than
the ruler test? Answer: Computers can give a more precise reaction
time because they remove human error.
Computers can record the reaction time to a millisecond so more
accurate.
,Computers remove the possibility that a person can predict when to
respond by using a persons body language.
◉ What is auxin? Answer: A growth hormone found in the roots and
shoots of plants. It controls the growth of plants in response t light,
gravity and water.
◉ What does phototropism mean? Answer: The movement of a plant
towards light.
◉ If light is coming from one side of a plant what will happen.
Answer: Auxin diffuses to the dark/shaded side of plant. This causes
the cells to grow faster on that side (elongate) which causes the
shoot to bend twards the light.
◉ What till happen if the tip of a shoot is removed from a plant?
Answer: There will be no auxin as auxin is found in the shoot. The
plant will not grow.
◉ What effect does auxin have on shoots and roots? Answer: Auxin
promotes growth in shoots and inhibits growth in roots.
◉ What will happen to a shoot if it is growing sideways? Answer:
Auxin moves to the lower side of the shoot and the root. This is
caused by gravity. It cause the lower side of the shoot to grow faster
,so the shoot bends upwards towards the light. In the root the lower
side grows slower meaning the root bends downwards.
◉ How can auxins be used to kill weeds? Answer: Most weeds
growing in a field of crops or on a lawn are broad leaved, in contrast
to grasses and cereals which are narrow leaves. Selective
weedkillers have been developed using auxin to kill only broad leaf
plants by disrupting their growth patterns.
◉ What does ethene do? Answer: Stimulates the ripening of fruit.
◉ What does gibberellin do? Answer: Stimulates seed germination,
stem growth and flowering.
◉ Give three ways auxin is used commercially? Answer: Killing
weeds, growth from cuttings using rooting powder, growing cells in
tissue culture.
◉ What are chromosomes? Answer: Long molecules of DNA inside a
nucleus.
23 pairs inside the nucleus of body cells.
◉ What is DNA? Answer: DeoxyriboNucleic Acid. It is a chemical that
all genetic material in a cell is made from. It is a polymer. It is made
up of two strands coiled together as a double helix.
, ◉ What is the structure of DNA? Answer: DNA strands are polymers
made up of repeating nucleotides.
Each nucleotide is made up of one sugar (deoxyribose) and a
phosphate.
The sugar phosphate molecules form the backbone to the DNA
stands. One of the four bases ACTG joins to the sugar molecule.
◉ How do the bases pair in DNA? Answer: A-T and G-C
◉ How many bases code for an amino acid? Answer: Three/triplets
◉ What is a gene? Answer: Small section of DNA found on a
chromosome
Genes tell cells in what order/sequence to put amino acids in to
make specific protein.
◉ How are proteins synthesised? Answer: DNA unwinds exposing
one strand.
An mRNA copy is made using the DNA as a template. U replaces T.
The first stage happens in the nucleus. (Transcription). mRNA is
single stranded and can leave through the DNA pore.
Proteins are made in the cytoplasm.
PAPER 2F 8464/B/2F TESTED REVISION PAPER
2026 QUESTIONS AND SOLUTIONS
◉ Evaluate the benefits and risks of procedures carried out on the
brain and the nervous system. Answer: +ve- Can lead to the
treatment for disorders of the nervous system
-ve- The brain is complex and delicate. The treatment of brain
damage is difficult. It also carries risks such as physical damage or
increased problems with brain damage e.g. speech.
NB: ADD A CONCLUSION.
◉ What is reaction time? Answer: The time it takes to respond to a
stimulus
◉ What is reaction time affected by? Answer: Age, drugs e.g. caffeine
or gender
◉ Why are computers a better way of measuring reaction time than
the ruler test? Answer: Computers can give a more precise reaction
time because they remove human error.
Computers can record the reaction time to a millisecond so more
accurate.
,Computers remove the possibility that a person can predict when to
respond by using a persons body language.
◉ What is auxin? Answer: A growth hormone found in the roots and
shoots of plants. It controls the growth of plants in response t light,
gravity and water.
◉ What does phototropism mean? Answer: The movement of a plant
towards light.
◉ If light is coming from one side of a plant what will happen.
Answer: Auxin diffuses to the dark/shaded side of plant. This causes
the cells to grow faster on that side (elongate) which causes the
shoot to bend twards the light.
◉ What till happen if the tip of a shoot is removed from a plant?
Answer: There will be no auxin as auxin is found in the shoot. The
plant will not grow.
◉ What effect does auxin have on shoots and roots? Answer: Auxin
promotes growth in shoots and inhibits growth in roots.
◉ What will happen to a shoot if it is growing sideways? Answer:
Auxin moves to the lower side of the shoot and the root. This is
caused by gravity. It cause the lower side of the shoot to grow faster
,so the shoot bends upwards towards the light. In the root the lower
side grows slower meaning the root bends downwards.
◉ How can auxins be used to kill weeds? Answer: Most weeds
growing in a field of crops or on a lawn are broad leaved, in contrast
to grasses and cereals which are narrow leaves. Selective
weedkillers have been developed using auxin to kill only broad leaf
plants by disrupting their growth patterns.
◉ What does ethene do? Answer: Stimulates the ripening of fruit.
◉ What does gibberellin do? Answer: Stimulates seed germination,
stem growth and flowering.
◉ Give three ways auxin is used commercially? Answer: Killing
weeds, growth from cuttings using rooting powder, growing cells in
tissue culture.
◉ What are chromosomes? Answer: Long molecules of DNA inside a
nucleus.
23 pairs inside the nucleus of body cells.
◉ What is DNA? Answer: DeoxyriboNucleic Acid. It is a chemical that
all genetic material in a cell is made from. It is a polymer. It is made
up of two strands coiled together as a double helix.
, ◉ What is the structure of DNA? Answer: DNA strands are polymers
made up of repeating nucleotides.
Each nucleotide is made up of one sugar (deoxyribose) and a
phosphate.
The sugar phosphate molecules form the backbone to the DNA
stands. One of the four bases ACTG joins to the sugar molecule.
◉ How do the bases pair in DNA? Answer: A-T and G-C
◉ How many bases code for an amino acid? Answer: Three/triplets
◉ What is a gene? Answer: Small section of DNA found on a
chromosome
Genes tell cells in what order/sequence to put amino acids in to
make specific protein.
◉ How are proteins synthesised? Answer: DNA unwinds exposing
one strand.
An mRNA copy is made using the DNA as a template. U replaces T.
The first stage happens in the nucleus. (Transcription). mRNA is
single stranded and can leave through the DNA pore.
Proteins are made in the cytoplasm.
