Edexcel GCSE Combined Science Paper 2: Biology 2 Foundation November 2020 question paper 1SC0/2BF

Figure 1 shows a diagram of the heart.

Figure 1

Draw arrows on Figure 1 to show how oxygenated blood moves through the heart.

What happens when the right ventricle contracts?

Draw one straight line from each structure to its function.

Figure 2 shows a dissected vein.

Explain how the valves in veins help the blood, at low pressure, flow towards the heart.

The equipment used to dissect the vein was cleaned and put into disinfectant.

State why this equipment was put into disinfectant.

The animal shown in Figure 3 is a tick burrowing into the skin of a human.

Use words from the box to complete the sentences.

The tick burrows into the skin to obtain_........ .

When a tick burrows into human skin the tick benefits but the human is harmed.

This means that ticks are classed as_........ .

When skin is cut a blood clot forms.

Which part of the blood starts the clotting process?

Figure 4 shows a bird called an oxpecker eating ticks that are living on a zebra.

Name the type of relationship where both the oxpecker and the zebra benefit.

Zebras eat grass.

Complete the food chain that includes zebras, ticks, oxpeckers and grass.

Figure 5 shows the maximum numbers of oxpeckers observed on four types of mammal.

Describe the difference in the maximum number of oxpeckers on the white rhino and on the hippo.

Give one reason why more oxpeckers were observed on giraffes than on zebras.

A scientist investigated the distribution of invertebrates found in a garden.

Figure 7 shows 30 invertebrates that the scientist collected.

Complete the table by filling in the tally and number for the spiders and worms.

The scientist selected an invertebrate at random to observe it in more detail.

State the probability that the invertebrate selected is an ant.

Give your answer in its simplest form.

State how the type of food used to bait the pitfall trap could affect the number of different invertebrates caught.

The scientist also counted the number of snails in four 1m² areas of the garden.

The garden had a total area of 40 m².

Describe how the scientist can use this information to estimate the number of snails in the garden.

Which row of the table shows the endocrine gland and hormone involved in the control of blood glucose concentration?

State a target organ for the hormone that controls blood glucose concentration.

People with a high BMI are more likely to develop type 2 diabetes. Figure 8 shows the mass, height and BMI for two people.

Use the formula to calculate the BMI for person A

Person B develops type 2 diabetes.

Describe two lifestyle changes person B should make to help to control their blood glucose concentration.

Which row of the table shows the type or types of respiration that use glucose?

A scientist measured the rate of respiration in a person when sleeping and then running at different speeds.

Figure 9 shows the results.

Explain the trend shown in Figure 9.

Figure 10 shows the leaves and flowers of water lily plants (Nymphaea odorata) on a lake.

Water lilies have stomata on the upper surface of the leaves.

Explain why water lilies have no stomata on the lower surface of the leaves.

The white petals of the water lily flowers cannot photosynthesise.

Which structure in leaf cells is the site of photosynthesis?

Glucose is made by photosynthesis.

Glucose is converted to another sugar to be transported in the plant.

What is the name of this sugar?

Describe how this sugar is transported from the leaves to the flowers of the water lily.

Figure 11 shows water lilies growing in a lake in Europe.

One water lily plant was brought from America 10 years ago and planted in the lake shown in Figure 11.

Explain why this non‑indigenous plant now covers the whole surface of the lake.

Explain how the water lilies will affect the biodiversity of this lake.

A slide of potato cells was viewed using a light microscope.

Figure 12 is a drawing of the slide showing starch grains in the potato cells.

Calculate the mean number of starch grains in potato cells P, Q and R.

_........ starch grains

Which structures are found in plant cells but are not found in animal cells?

A scientist investigated how the length of starch grains in potatoes changed when the potatoes were stored in the dark.

Figure 13 shows a potato after being stored in the dark.

Three potatoes were used in the investigation.

The length of starch grains in potato 1 were measured at the start.

The length of starch grains were measured in potato 2 after 5 weeks in the dark.

The length of starch grains were measured in potato 3 after 10 weeks in the dark.

Figure 14 shows the results.

Calculate the percentage difference in the mean length of starch grains in potato 2 at 5 weeks and in potato 3 at 10 weeks.

_........ %

State two variables the scientist should have controlled to improve this investigation.

The starch grains in the potatoes became smaller as the starch was converted into glucose.

State why the potatoes need glucose.

*(c) Figure 15 shows a diagram of some equipment that can be used to investigate the rate of photosynthesis.

Devise a plan to investigate the effect of light intensity on the rate of photosynthesis.

Include variables you would need to control.