AQA GCSE BIOLOGY 8464 1H PAPER ONE
HIGHER TIER MARK SCHEME 2026 FINAL
VERSION
◉ anaerobic respiration. Answer: an exothermic reaction in which
glucose is broken down in the absence of oxygen to produce lactic acid
in animals and ethanol and carbon dioxide in plants and yeast. A small
amount of energy is transferred for the cells
◉ exothermic reaction. Answer: a reaction that transfers energy to the
environment
◉ glycogen. Answer: carbohydrate store in animals
◉ lactic acid. Answer: the end product of anaerobic respiration in animal
cells
◉ oxygen debt. Answer: the extra oxygen that must be taken into the
body after exercise has stopped to complete the aerobic respiration of
lactic acid
◉ Mitochondria. Answer: Organelle that is the site of respiration
,◉ Responses to exercise. Answer: Heart rate increases, Breathing rate
increases, glycogen in muscles is converted to glucose
◉ endothermic reaction. Answer: a reaction that requires a transfer of
energy from the environment
◉ glucose. Answer: a simple sugar
◉ limiting factors. Answer: limit the rate of a reaction, for example
photosynthesis
◉ photosynthesis. Answer: the process by which plants make food using
carbon dioxide, water, and light
◉ Reactants for photosynthesis. Answer: water and carbon dioxide
◉ Products of photosynthesis. Answer: glucose and oxygen
◉ Chloroplast. Answer: Site of photosynthesis
◉ white blood cells. Answer: Blood cells that perform the function of
destroying disease-causing microorganisms
, ◉ Sperm cells. Answer: It has a long tail and a streamlined head to help
it swim. There are a lot of mitochondria in the cell to provide the energy
needed. It also carries enzymes in its head to digest through the egg cell
membrane.
◉ light. Answer: energy source for photosynthesis
◉ aorta. Answer: the artery that leaves the heart from the left ventricle
and carries oxygenated blood to the body
◉ arteries. Answer: blood vessels that carry blood away from the heart.
They usually carry oxygenated blood and have a pulse
◉ atria. Answer: the upper chambers of the heart
◉ capillaries. Answer: the smallest blood vessels. They run between
individual cells and have a wall that is only one cell thick
◉ coronary arteries. Answer: the blood vessels that supply oxygenated
blood to the heart muscle
◉ double circulatory system. Answer: the circulation of blood from the
heart to the lungs is separate from the circulation of blood from the heart
to the rest of the body
HIGHER TIER MARK SCHEME 2026 FINAL
VERSION
◉ anaerobic respiration. Answer: an exothermic reaction in which
glucose is broken down in the absence of oxygen to produce lactic acid
in animals and ethanol and carbon dioxide in plants and yeast. A small
amount of energy is transferred for the cells
◉ exothermic reaction. Answer: a reaction that transfers energy to the
environment
◉ glycogen. Answer: carbohydrate store in animals
◉ lactic acid. Answer: the end product of anaerobic respiration in animal
cells
◉ oxygen debt. Answer: the extra oxygen that must be taken into the
body after exercise has stopped to complete the aerobic respiration of
lactic acid
◉ Mitochondria. Answer: Organelle that is the site of respiration
,◉ Responses to exercise. Answer: Heart rate increases, Breathing rate
increases, glycogen in muscles is converted to glucose
◉ endothermic reaction. Answer: a reaction that requires a transfer of
energy from the environment
◉ glucose. Answer: a simple sugar
◉ limiting factors. Answer: limit the rate of a reaction, for example
photosynthesis
◉ photosynthesis. Answer: the process by which plants make food using
carbon dioxide, water, and light
◉ Reactants for photosynthesis. Answer: water and carbon dioxide
◉ Products of photosynthesis. Answer: glucose and oxygen
◉ Chloroplast. Answer: Site of photosynthesis
◉ white blood cells. Answer: Blood cells that perform the function of
destroying disease-causing microorganisms
, ◉ Sperm cells. Answer: It has a long tail and a streamlined head to help
it swim. There are a lot of mitochondria in the cell to provide the energy
needed. It also carries enzymes in its head to digest through the egg cell
membrane.
◉ light. Answer: energy source for photosynthesis
◉ aorta. Answer: the artery that leaves the heart from the left ventricle
and carries oxygenated blood to the body
◉ arteries. Answer: blood vessels that carry blood away from the heart.
They usually carry oxygenated blood and have a pulse
◉ atria. Answer: the upper chambers of the heart
◉ capillaries. Answer: the smallest blood vessels. They run between
individual cells and have a wall that is only one cell thick
◉ coronary arteries. Answer: the blood vessels that supply oxygenated
blood to the heart muscle
◉ double circulatory system. Answer: the circulation of blood from the
heart to the lungs is separate from the circulation of blood from the heart
to the rest of the body
