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P40132A©2012 Pearson Education Ltd.

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*P40132A0124*

BiologyUnit: KBI0/4BI0Science (Double Award) KSC0/4SC0Paper: 1B

KGV Mock Examination 2013Time: 1.5 hours

KBI0/1B 4BI0/1BKSC0/1B 4SC0/1B

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Instructions

Use black ink or ball-point pen. Fill in the boxes at the top of this page with your name,

centre number and candidate number. Answer all questions. Answer the questions in the spaces provided

– there may be more space than you need. Show all the steps in any calculations and state the units.

Information The total mark for this paper is 90. The marks for each question are shown in brackets

– use this as a guide as to how much time to spend on each question.

Advice

Read each question carefully before you start to answer it. Keep an eye on the time. Write your answers neatly and in good English. Try to answer every question. Check your answers if you have time at the end.

Edexcel Certificate

Edexcel International GCSE

1

Answer ALL questions.

1. All living organisms share some basic characteristics.

(a) Give three characteristics shared shown by living organisms.

(3)

1 ...................................................................................................................................................................................................................................

2 ...................................................................................................................................................................................................................................

3 ...................................................................................................................................................................................................................................

(b) Complete the table to show whether the following structures are present or absent in plant and animal cells.

If a feature is present, insert a tick () and if it is absent, insert a cross (x).

The first line has been done for you.

(5)

Feature Plant cells Animal cells

nucleus

cell membrane

chloroplasts

glycogen

starch

cell wall

(Total 8 marks)

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2. The animal cell below has a diploid number of eight. The cell is dividing by mitosis.

(a) Name the parts labelled A, B and C.

(3)

A ..................................................................................................................................................................................................................................

B ...................................................................................................................................................................................................................................

C ...................................................................................................................................................................................................................................

(b) A student wrote this passage describing mitosis. There are two mistakes.

The diploid number of this cell is 8. It will divide into

four daughter cells, each with a diploid number of 8.

Mitosis is a very important type of cell division for

growth, repair, cloning and sexual reproduction.

What are the two mistakes in the passage?

(2)

1 ...................................................................................................................................................................................................................................

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2 ...................................................................................................................................................................................................................................

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(c) What is the diploid number in a human body cell?

(1)

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(Total 6 marks)

C

B

A

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3 (a) Describe how the structure of a virus differs from that of a fungus.

(4)

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(b) Give an example of a disease caused by each of the following.

(i) A bacterium

(1)

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(ii) A virus

(1)

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(iii) A protoctist

(1)

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(iv) A fungus

(1)

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(Total 8 marks)

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4. Describe an experiment you could carry out to determine the effect of temperature on the rate of osmosis in plant tissue.

(6)

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(Total 6 marks)

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5. The diagram shows a food web from a grassland ecosystem.

(a) From the food web, name an organism that is

(i) a producer

(1)

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(ii) a primary consumer

(1)

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(iii) a tertiary consumer

(1)

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(b) How many different organisms feed on the grasshopper in the food web?

(1)

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(c) From the food web, draw a food chain that contains 5 levels and includes the spider.

(3)

(d) A land owner wanted to reduce the number of rabbits feeding on his grass, so he killed a large number of rabbits.

Suggest an explanation for the effect this would have on the following populations.

(i) Hawk

(2)

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(ii) Mouse

(2)

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(Total 11 marks)

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6. Batten disease is caused by a recessive allele. Symptoms include loss of vision, epilepsy and difficulty in walking and talking.

The mutation causes lipofuscins to build-up in the body's tissues. Lipofuscins consist of fats and proteins and form distinctive deposits that cause the symptoms.

(a) Name one system in the body affected by Batten disease.

(1)

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(b) Two adults who had never shown any symptoms married and had a child who developed Batten disease.

Show the genotypes of the parents, the gametes they form and the possible genotypes and phenotypes of the offspring.

(4)

Parent

genotypes

Gametes

Possible offspring

genotypes

Possible offspring

phenotypes

8

(c) Recessive conditions, like Batten disease, are usually very rare in populations.

However, if someone who comes from a family with a history of the disease marries a cousin then the likelihood of inheriting the condition changes.

Suggest why this is the case.

(2)

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(Total 7 marks)

9

7. The table shows some features of plants which live in different places.

Draw a line from each environment to link it to the features you would expect to find in the plants growing in that environment. One has been done for you.

(3)

Place

Plant features

Desert environment with no rainfall for long periods

Thin cuticle

Single epidermal layer

Very dry with little rainfall

Thick cuticle

Presence of hairs Few stomata on lower epidermis only

Wet soil shaded from the sun

Succulent stems / leaves

Store water

Floating on water

Thin cuticle

Thin epidermis No stomata

Submerged in water

Stomata present on top surface only

Air cavities to provide buoyancy

(Total 3 marks)

10

8. Angela carried out an experiment to investigate how breathing rate changes during exercise.

She worked with a partner who counted the number of breaths she took during

three periods of 20 seconds at rest

three periods of 20 seconds after 5 minutes of exercise

three periods of 20 seconds after 10 minutes of exercise.

The results that Angela collected from her experiment are given in the table.

Period of exercise

Number of breaths

in 20 seconds 1st period

Number of breaths

in 20 seconds 2nd period

Number of breaths

in 20 seconds 3rd period

Average breathing rate in breaths per

minute

At rest 5 6 5 ?

After 5 minutes 15 16 14 45

After 10 minutes 18 20 18 56

(a) Calculate Angela’s average breathing rate in breaths per minute at rest.

(1)

Answer ........................................................

(b) Why did Angela take three readings after each period of exercise?

(1)

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(c) Give two variables that Angela should have controlled in her experiment. For each variable describe how she could control it.

(4)

Variable 1 .............................................................................................................................................................................................................

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Variable 2 .............................................................................................................................................................................................................

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(d) (i) State how Angela’s breathing rate changed during exercise.

(1)

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(ii) Explain why Angela’s breathing rate changed during exercise.

(4)

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(e) What other feature of breathing may change during exercise? Give a reason for your answer.

(2)

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(f) A very fit athlete was tested in the same way.

Suggest how the athlete’s results may be different from Angela’s.

(2)

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(Total 15 marks)

13

9. Oil seed rape is an important crop plant grown by farmers.

(a) The stages below are used to insert a gene for herbicide resistance into crop plants such as oil seed rape.

Place the stages in the correct order by writing the order (1, 2, 3, 4 or 5) in the table.

(4)

Stage Order

Recombinant DNA inserted into the crop plant cell using a vector.

Desired gene for herbicide resistance inserted into recipient DNA using an enzyme.

Desired gene for herbicide resistance removed from donor cell using an enzyme.

The plant is herbicide resistant.

Desired gene for herbicide resistance identified.

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(b) Give one example of a vector used in genetic modification.

(1)

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(c) State the role of restriction enzymes and ligase enzymes in genetic modification.

(2)

restriction enzymes ...................................................................................................................................................................................

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ligase enzymes .................................................................................................................................................................................................

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(d) (i) What is meant by the term herbicide?

(1)

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(ii) Give a reason why a farmer would want his crop plants to be resistant to a herbicide.

(1)

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(e) Suggest why some people are concerned about genetically modified (GM) crops.

(2)

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(Total 11 marks)

15

10.The table shows data taken from dairy farms in the UK. It shows changes in milk yield and dairy herd size (number of cows) between the years 2000 and 2008.

Year Average milk yield in litres per cow

per year

Average size of dairy herd

in thousands

2000 6,048 2,330

2001 6,449 2,229

2002 6,450 2,224

2003 6,631 2,185

2004 6,886 2,060

2005 6,999 2,003

2006 6,963 1,989

2007 6,924 1,961

2008 6,945 1,902

(a) On the grid, plot the data to show how average milk yield changed during the years 2000 to 2008. Join your points using straight lines.

(5)

16

(b) Describe how the average milk yield per cow changes over the time period.

(2)

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(c) Suggest why the average size of dairy herds has changed during this period.

(1)

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(d) Describe how a selective breeding programme could be used to produce an improvement in milk yield.

(3)

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(e) Improvement in milk yield can be affected by factors other than selective breeding.

Suggest two factors that a farmer could change that could lead to an improvement in milk yield. For each factor you name, give a reason why it would improve milk yield.

(4)

Factor 1 ...................................................................................................................................................................................................................

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Reason ....................................................................................................................................................................................................................

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Factor 2 ..................................................................................................................................................................................................................

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Reason ....................................................................................................................................................................................................................

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(Total 15 marks)

TOTAL MARKS = 90

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