AQA GCSE Trilogy Biology Paper 1 Foundation June 2019 question paper 8464/B/1F

A student investigated the effect of light intensity on the rate of photosynthesis.

Figure 1 shows some of the apparatus used.

Name the gas produced by the pondweed in the light.

Describe one way the student could change the intensity of light reaching the pondweed.

Describe how the student could use the apparatus in Figure 1 to measure the rate of photosynthesis.

Figure 2 shows the student’s results.

What was the maximum rate of photosynthesis?

At which light intensity was light a limiting factor?

Tick (✓) one box.

Light intensity can affect the rate of photosynthesis.

Give one other factor that can affect the rate of photosynthesis.

A single-celled organism has a large surface area to volume ratio.

How does oxygen enter a single-celled organism?

Tick (✓) one box.

Figure 3 shows two cubes.

The surface area to volume ratio for cube A is 6:1

Calculate the surface area to volume ratio of cube B.

Surface area of one face of cube B

Total surface area of cube B

Volume of cube B

Multicellular organisms have exchange surfaces to absorb substances.

Figure 4 shows part of the exchange surface in the lungs.

Oxygen passes from the alveolus into the blood.

Name the part of the blood that carries the most oxygen.

Name the gas that passes out of the blood into the alveolus.

Alveoli provide a large surface area for gas exchange.

Give two other ways the lungs are adapted for efficient gas exchange.

This question is about organisation in living organisms.

Write the biological structures from the box in the correct size order.

Name one animal organ.

Which is a plant tissue?

Tick (✓) one box.

Figure 5 shows part of a root viewed using a microscope.

Figure 5

This image cannot be reproduced here due to third-party copyright restrictions

Explain how a root hair cell is specialised for its function.

Figure 6 shows a microscope.

It is easier to view the cells using the low power objective lens first.

Give one reason why.

To focus the image the objective lens should be moved away from the stage.

Give one reason why the objective lens should not be moved towards the stage.

The image of the prepared slide in Figure 6 is viewed with the ×10 objective lens.

The total magnification is ×50

What was the power of the eyepiece lens used?

Root hair cells do not contain chloroplasts.

Suggest one reason why.

Water is lost from the leaves of a plant through stomata.

What is the process by which water is lost from the leaves of a plant?

Tick (✓) one box.

Figure 7 shows stomata on the lower surface of a leaf.

What is the name of cell X ?

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The length of cell X is 25 mm when viewed at a magnification of ×800

Calculate the real length of cell X.

Give your answer in micrometres (µm).

1 mm = 1000 µm

Use the equation:

A student measured the mass of water lost from some similar plants. The plants were at different temperatures.

Figure 8 shows the apparatus used.

This is the method used.

1. Seal a plastic bag around the pot of a potted plant.

2. Place the potted plant with the bag on a balance in a room at 20 °C

3. Record the mass.

4. After 3 hours record the mass again.

5. Calculate the mass of water lost from the plant.

6. Repeat steps 1–5 at 25 °C and at 30 °C with other similar plants.

What was the independent variable in this investigation?

Tick (✓) one box.

Suggest why the student sealed a plastic bag around the pot.

Table 1 shows the student’s results.

What is the resolution of the balance used in this investigation?

Tick one box.

Calculate value X in Table 1.

Give one conclusion that can be made from the results in Table 1.

Give two factors that might affect the rate of water loss from the leaves.

Do not refer to temperature in your answer.

Malaria is a disease transmitted by mosquitos.

Figure 9 shows information about the number of deaths from malaria.

Calculate the decrease in the number of deaths between 2000 and 2015.

Which time period shows the greatest decrease in the number of deaths?

Tick (✓) one box.

A student looked at Figure 9 and concluded that there were 800 000 deaths from malaria in 2002.

Suggest one reason why this conclusion might not be correct.

What type of pathogen causes malaria?

Tick (✓) one box.

Scientists are developing a vaccine against malaria.

Suggest how a vaccine against malaria could reduce the spread of the disease.

Give one way of controlling the spread of malaria.

Do not refer to a vaccine in your answer.

Figure 10 shows a human heart.

Which blood vessel carries deoxygenated blood away from the heart to the lungs?

Tick (✓) one box.

The natural resting heart rate is controlled by a group of cells that act as a pacemaker.

Where in the heart are ‘pacemaker cells’ found?

Tick (✓) one box.

Some people may be treated with a drug to slow their heart rate.

Digitalis is a drug that slows the heart rate.

Where does the drug digitalis originate from?

Tick (✓) one box.

Beta blockers are another type of drug that slows the heart rate.

Table 2 shows information for people who do not take beta blockers and for people who do take beta blockers.

• Stroke volume is the volume of blood pumped out of the heart each time it beats.

• Cardiac output is the total volume of blood pumped out of the heart each minute.

Calculate stroke volume X in Table 2.

Use the equation: cardiac output = stroke volume × heart rate

Give your answer to 2 significant figures.

Some people who take beta blockers get out of breath when they exercise.

Explain why beta blockers can have this effect during exercise.

You should refer to information given in Table 2.

This question is about digestion.

Name the enzyme that digests starch in the human digestive system.

A student set up a model to represent the digestion and absorption of food molecules in the digestive system.

Figure 11 shows the student’s model.

This is the method used.

1. Fill a test tube with water at 37 °C

2. Test the water for starch and for sugar.

3. Mix together starch and enzyme solution and immediately test it for starch and for sugar.

4. Fill some partially permeable tubing with the starch and enzyme mixture.

5. Seal the tubing and place it in the test tube of water.

6. Place the test tube in a water bath at 37 °C

7. After 30 minutes, test the mixture inside the partially permeable tubing and test the water in the test tube for starch and for sugar.

Suggest which parts of the body the partially permeable tubing and the water in the test tube represent.

Partially permeable tubing

Water in the test tube

Table 3 shows the results.

✗ = Not present

Name the reagents used to test for starch and for sugar.

Why was there no sugar present in test 1 ?

Explain the results for test 3.

Explain the results for test 4.