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

Figure 1 shows three cells.

What is structure X ?

The bacterial cell in Figure 1 has a flagellum.

State the function of a flagellum.

Give one other difference between the bacterial cell and the animal cell shown in Figure 1.

Substances move into and out of cells.

How does oxygen move into and out of cells?

A plant leaf cell is 0.04 mm long.

Calculate the length of the image after this cell has been magnified 500 times.

length of image =_........ mm

A student placed three different sized cubes of agar jelly into separate beakers containing the same concentration of hydrochloric acid.

The cubes contained a pink indicator.

This indicator becomes clear when in contact with an acid.

Figure 2 shows the results of the investigation after the cubes had been in the acid for 120 seconds.

The distance from the outside of cube B to the pink area was 3 mm.

Calculate the distance diffused by hydrochloric acid in one second.

_........ mm

The student wanted to confirm their results.

Give one improvement the student should make to this investigation to confirm their results.

Devise a method, using cubes of agar jelly, to investigate how temperature affects the rate of diffusion.

Some substances move into and out of cells by active transport.

Which is the correct description of the movement of a substance by active transport?

Some drugs used to treat cancer are taken into cells by active transport.

Figure 3 shows some causes of preventable cases of cancer in 2015.

What is the percentage of preventable cases of cancer that are caused by tobacco?

In 2015, data from Cancer Research UK suggested that 163 440 cases of cancer could have been prevented.

Calculate the number of preventable cases of cancer caused by alcohol.

Give your answer to the nearest whole number.

number of preventable cases of cancer caused by alcohol_........

Farmers selectively breed chickens to produce larger chickens.

Figure 4 shows how the size of chickens has changed over time.

Explain how farmers have used selective breeding to produce larger chickens.

Describe one benefit and one risk of selectively breeding chickens.

benefit_........

The body cells of chickens have 78 chromosomes in their nuclei.

State the number of chromosomes found in each sex cell of a chicken.

Name the type of cell division which produces sex cells.

What is the correct definition of a genome?

A new project called the Earth BioGenome Project aims to discover the sequence of bases in the DNA for all plants and animals.

State two benefits of discovering the sequence of bases for all plants and animals.

A student investigated the activity of a human enzyme at different temperatures.

The student measured the mass of product formed after 10 minutes at different temperatures.

Figure 5 shows the results of this investigation.

Describe the trends shown in Figure 5.

Explain the results obtained for temperatures from 40 °C to 60 °C.

Some enzymes are involved in the breakdown of food substances.

Draw one straight line from each food group to the products of digestion for that food group.

Which enzyme breaks down fat?

Figure 6 shows an enzyme and two substrates, P and Q.

Explain the reason why no product will be formed if the enzyme is mixed with substrate Q.

Measles is a communicable disease caused by a virus.

What can a virus also be classified as?

Give one reason why measles is described as a communicable disease.

The human immunodeficiency virus (HIV) can cause AIDS.

Which type of cell is destroyed by the HIV virus?

Describe how the specific immune system defends the body against disease.

Figure 7 shows the number of people per million of the population in five European countries who were diagnosed with measles in one year.

The population of Belgium in that year was 11.18 million.

Calculate the number of people in Belgium diagnosed with measles.

Give your answer to three significant figures.

_........ people

Countries do not report the total number of people diagnosed with measles. Countries report the number of people diagnosed with measles per million of the population.

Give one reason why this is better.

Give one reason why the number of people per million diagnosed with measles is different in these countries.

Figure 8 shows a banana plantation.

After the bananas have been harvested, the old plants are cut down.

The suckers then develop into mature plants producing the next crop of bananas.

The tip of each sucker contains a group of cells called a meristem.

Describe the function of a meristem in the growth of a plant.

A student took a sample of cells from a meristem to view under a light microscope.

Describe how the student would prepare a microscope slide using these cells.

Figure 9 is a drawing of a eukaryotic cell.

Structure Z is found in plant leaf cells.

Name structure Z.

Give one function of the mitochondrion.

*(c) DNA is found in the nucleus of cells.

Describe the structure of DNA and how it can be extracted from plant cells.