AQA Past Papers Practice

Give the reason why the volume of the mixture did not increase at 80 °C.

A leaf has many pores called stomata.
Water vapour is lost from a plant by diffusion through the stomata.
At what temperature would most water vapour be lost from a leaf?

Owls are large birds.
Owls eat mice and small birds.
Which food chain is the most efficient at transferring energy from plants to owls?

Which specimen in Table 1 would only be visible with an electron microscope?

The nucleus of the animal cell contains chromosomes.
Name the molecule chromosomes are made from

Label parts B on Figure 1.

In Mendel’s breeding experiment there were 297 purple flowers and 105 white flowers
in the second generation.
Calculate the actual ratio Mendel achieved.
Give your answer to 3 significant figures.

Ratio of purple flowers : white flowers =?

This question is about white blood cells and pathogens.
White blood cells have cell membranes.
Describe the function of the cell membrane.

Ebola is a disease caused by a viral pathogen.
The Ebola virus attaches to the cell membranes of some body cells.
The Ebola virus can spread very quickly by direct contact with infected patients or
their body fluids.
In countries where there are outbreaks of Ebola, people are advised to wash their
hands regularly.
Suggest how regular hand washing reduces the spread of the Ebola virus

Research shows that tobacco smoke increases the risk of a tumour forming.
Choose one other factor that increases the risk of a tumour forming

A leaf is a plant organ.
Name two other plant organs.

Ebola is a disease caused by a viral pathogen.
The Ebola virus attaches to the cell membranes of some body cells.
The Ebola virus can spread very quickly by direct contact with infected patients or
their body fluids

Choose one other way to reduce the spread of the Ebola virus.

Choose three ways white blood cells defend the body against pathogens.

Yeast can also respire aerobically.
Complete the sentence to give one way in which aerobic respiration is different from anaerobic respiration

Choose the answer (carbon, energy, oxygen, glucose)

Aerobic respiration releases more ………………………than
anaerobic respiration.

People must be vaccinated with a new vaccine each year to prevent infection from
influenza.
Explain why a new vaccine is used each year.

Label parts A on Figure 1.

Name a technique which could be used to quickly produce large numbers of the
genetically engineered plants

Vaccination of a large proportion of the population will help to protect those who are
not vaccinated.
Give a reason why

Increased levels of carbon dioxide in the atmosphere contribute to global warming.

Choose two possible effects of global warming.

Metabolism is the name given to all chemical reactions in the body.

Name the chemical reaction in the body that releases energy

Bacteria can enter the body during breathing.
Antibiotics are used to kill bacteria without affecting our body cells.
Many antibiotics work by destroying the outer layer of the bacterial cell.
Suggest why these antibiotics do not kill body cells.

Which specimen in Table 1 would be visible without a microscope?

Brain cells can be damaged by toxins.
Liver failure can cause brain damage.
Explain how liver failure can cause brain damage.

What does anaerobic mean?

Between which two groups is there the largest increase in death rate? box
Use Table 1.

Gregor Mendel carried out breeding experiments with box pea plants from 1856 to 1863.

Mendel thought that characteristics were controlled by ‘inherited factors’.
What are these ‘inherited factors’ now called?

The number of people who smoke cigarettes has decreased since the 1990s.
Choose reason why