AQA GCSE Trilogy Biology Paper 1 Higher June 2024 question paper 8464/B/1H

Drinks contain different substances.

A drinks company claims that a drink contains sugar, protein and fat.

Glucose and fructose are different sugars.

Fructose has a much sweeter taste than glucose.

Suggest two reasons why the drinks company uses fructose in the drink rather than using glucose.

Do not refer to sweetness in your answer.

Describe how a student could test the drink for sugar.

Give the colour of a positive result.

Colour of positive result

Describe how a student could test the drink for protein.

Give the colour of a positive result.

Colour of positive result

The human digestive system breaks down protein and fat in the drink.

Describe how protein and fat are digested.

You should include:

• the enzymes involved

• where the enzymes are produced.

A student investigated the concentration of salt in solution Z.

The student used a method involving osmosis.

The student used tubing made of partially permeable membrane.

This is the method used.

1. Cut six pieces of tubing to the same length.

2. Tie one end of each piece of tubing.

3. Put the same volume of solution Z into each piece of tubing.

4. Tie the other end of each piece of tubing to form a sealed tube.

5. Record the mass of each tube.

6. Place each tube into a different concentration of salt solution.

7. After 2 hours, remove each tube from the salt solutions.

8. Record the mass of each tube.

Figure 1 shows one of the sealed tubes in a salt solution.

What was the independent variable for the investigation?

Tick (✓) one box.

The student dried the outside of each tube with a paper towel before recording the mass.

Why was it important to dry the tubes?

Table 1 shows the results.

Calculate value X in Table 1.

Give your answer to 1 decimal place.

Complete Figure 2.

You should:

• plot the percentage change in mass from Table 1 for salt concentrations of only 0.2 mol/dm³ to 1.0 mol/dm³

• draw a line of best fit.

One of the results has been plotted for you.

Figure 2

Determine the concentration of salt in solution Z.

Use Figure 2.

This question is about communicable diseases.

Measles is a communicable disease caused by a pathogen.

What type of microorganism causes measles?

Vaccinations help reduce the spread of measles.

Suggest two ways the spread of measles can be reduced.

Do not refer to vaccination in your answer.

Describe how the measles vaccine helps a person to become immune to the measles pathogen.

Norovirus is a type of virus.

Explain how viruses cause illness.

Drugs can help to reduce the symptoms of the norovirus infection.

New drugs must go through clinical trials before being licensed for use.

Give three reasons why clinical trials are needed.

This question is about photosynthesis.

What is the symbol equation for photosynthesis?

Tick (✓) one box.

A student investigated the relationship between temperature and the rate

of photosynthesis.

The student measured the volume of gas produced by an aquatic plant in 1 hour.

The student collected the gas in a measuring cylinder.

Table 2 shows the results.

Describe the effect of increasing temperature on the rate of photosynthesis.

Use data from Table 2.

Explain why no gas was produced by the plant at 45 °C.

How could the student increase the accuracy of the results?

Tick (✓) one box.

A person grows tomatoes in a greenhouse.

The mean temperature of the greenhouse is 15 °C.

A heater would keep the temperature of the greenhouse at 25 °C.

Suggest two reasons against using a heater set at 25 °C in the greenhouse.

Do not refer to cost in your answer.

The person cut a stem from one of the tomato plants.

The cut stem was placed in soil to grow new roots.

Which tissue in the cut stem will differentiate into new root cells?

Tick (✓) one box.

This question is about microscopy.

Figure 3 shows bacteria viewed using a microscope.

What type of microscope was used to view the bacteria in Figure 3 ?

Give a reason for your answer.

Type of microscope

Bacterial cells are prokaryotic cells.

Give three ways that a prokaryotic cell is different from a eukaryotic cell.

Figure 4 shows a special slide used to determine the size of a cell viewed using a microscope.

Calculate the magnification of the cell shown in Figure 4.

Smoking increases the risk of lung cancer.

Figure 5 shows a lung cell dividing.

Describe the process of the cell cycle shown in Figure 5.

Lung cancer is malignant.

Explain what is meant by a malignant tumour.

Smoking can damage the lungs in different ways.

Figure 6 shows alveoli from the lungs of two people.

Person A and person B do the same exercise.

Explain why person B breathes much faster than person A during the exercise.

Angina is a condition many people get as coronary heart disease (CHD) develops.

Angina can cause chest pain and tiredness.

People with angina are sometimes treated with a drug called GTN.

GTN widens the coronary arteries.

Explain:

• the causes and symptoms of angina

• how GTN reduces the symptoms of angina.