Edexcel GCSEScienceBiology B1aTopic 1: EnvironmentTopic 2: GenesFoundation and Higher TiersMonday 25 June 2007 – Morning
Time: 20 minutes
Materials required for examination Items included with question papersMultiple Choice Answer Sheet NilHB pencil, eraser and calculator
Turn over
Instructions to CandidatesUse an HB pencil. Do not open this booklet until you are told to do so.Mark your answers on the separate answer sheet.
Foundation tier candidates: answer questions 1 – 24.Higher tier candidates: answer questions 17 – 40.All candidates are to answer questions 17 – 24.
Before the test begins:Check that the answer sheet is for the correct test and that it contains your candidate details.
How to answer the test:For each question, choose the right answer, A, B, C or Dand mark it in HB pencil on the answer sheet.For example, the answer C would be marked as shown.
Mark only one answer for each question. If you change your mind about an answer, rub out the firstmark thoroughly , then mark your new answer.
Do any necessary calculations and rough work in this booklet. You may use a calculator if you wish.
You must not take this booklet or the answer sheet out of the examination room.
The following passage was found in a science magazine.
9. How many different predators are named in the passage?
A oneB twoC four D six
10. Which is true?
A Predators compete with prey for foodB Predators compete with each other for food
C Predators are food for preyD Predators cannot be scavengers
11. How many cows and sheep were probably eaten each year by wolves in the area of the RockyMountains?
A 40B 130C 350D 480
12. The information suggests that
A cows and sheep will become extinctB wolves are better predators than mountain lionsC scavengers are not very good predatorsD cows and sheep are prey
In an area of the Rocky Mountains in the USA 130 cows and 350
sheep were eaten by wolves in a twelve year period. Wolves arepredators, wild animals that hunt other animals for their ownfood. Other predators are mountain lions, hawks and ferrets.Because these animals are meat eaters, they are also calledcarnivores. Some predators, such as coyotes and bears, are alsoscavengers, meaning they will eat the dead bodies of animals thatthey didn
Superheroes in cartoons have super powers because their genetic materialhas been changed.
13. Scientists can change genetic material.This process is called
A inheritanceB genetic modificationC selective breedingD variation
14. Which of these is not genetic material?
A alleleB geneC DNAD muscle
15. Warfarin is a poison used to kill rats. Super rats have developed a natural resistance toWarfarin.The increase in the number of super rats is an example of
Higher tier candidates start at question 17 and answer questions 17 to 40.Questions 17 to 24 must be answered by all candidates: Foundation tier and Higher tier.
Food chain
The diagram shows a food chain.
17. Which row of the table gives the correct names for the organisms in this food chain?
wheat rat flea
A producer herbivore carnivore
B herbivore carnivore producer C producer carnivore herbivore
D herbivore producer carnivore
18. Each rat in this food chain has many fleas feeding on its blood.Which is the pyramid of biomass for this food chain?
A B C D
19. A pyramid of biomass shows the amount of
A dry mass of organisms at one levelB dry mass of organisms at each levelC wet mass of organisms at one levelD wet mass of organisms at each level
20. It is more efficient to produce wheat as food than meat as food.This is because
A wheat contains less energyB meat contains more energyC less energy is wasted
The peppered moth, Biston betularia , can have light wings or dark wings.
moths on a tree trunk in polluted woodland
moths on a tree trunk in unpolluted woodland
The moths are eaten by birds.
A scientist wanted to find out which type of moth was better adapted in each type of woodland. Hereleased light and dark winged moths into a polluted and an unpolluted woodland. After a period of time he counted how many were left. His results are in the table.
21. The scientist calculated the percentage of moths recaptured from the polluted and unpollutedwoodlands.Which row of this table shows the largest percentage of moths recaptured?
woodland colour of wing
A polluted dark
B polluted light
C unpolluted dark
D unpolluted light
22. The recaptured moths had survived better.This is most likely because the birds could not
A smell the mothsB see the mothsC taste the mothsD touch the moths
23. The scientist concluded that natural selection had happened.The conclusion is only valid if the moths
A were eaten by birdsB flew away from the woodlandC died from diseaseD died from starvation
24. The peppered moths belong to
A the same kingdom and speciesB a different kingdom but the same speciesC a different kingdom and species
D the same kingdom but a different species
TOTAL FOR FOUNDATION TIER PAPER: 24 MARKS
Foundation tier candidates do not answer any more questions after question 24.
Questions 25 to 40 must be answered by Higher tier candidates only.Foundation tier candidates do not answer questions 25 to 40.
Sexual reproduction
Mammals such as lions reproduce sexually. The offspring are often similar but not genetically identical.
25. Sometimes twins are born. They can be genetically identical.Genetically identical organisms are called
A gametes B transgenic
C alleles D clones
26. The cubs born to the lions will inherit
A
all their genes from their mother B all their genes from their father C an equal number of genes from each parent D no genes from either parent
27. Some of the features of the lions are caused by environmental factors.Which is most likely to be an environmental effect?
A eye colour B fur colour
C sex D weight
28. The male lion carries the chromosomes XY. The female lioness carries the chromosomes XX.If a first cub is male, what is the chance of a second cub being female?
29. This cartoon of Charles Darwin appeared in a national newspaper.This is because his book stated that
A monkeys were an endangered speciesB monkeys and humans had a common ancestor C humans evolved from monkeysD the DNA of humans and monkeys is identical
30. Darwin’s theory was about evolution through
A natural selectionB artificial selectionC selective breedingD genetic modification
31. The Origin of Species was published in 1859.At the time, most of the scientific community
A agreed with Darwin’s observations and his interpretationsB agreed with Darwin’s observations but not his interpretationsC agreed with Darwin’s interpretations but not his observationsD disagreed with Darwin’s observations and interpretations
32. Which of these processes was not known about at the time when Darwin published histheory?
It is possible to identify the parents of a child by analysing the blood groups of the children.Scientists investigated two possible fathers of a child whose mother had the alleles A and i.The Punnett squares below show the gametes and possible offspring.
father 1 father 2
Blood groups can be A = Ai or AAB = Bi or BBAB = AB onlyO = ii only
37. Which is the possible father for a child with blood group A?
A father 1 only B father 2 only C father 1 or father 2 D neither father 1 nor father 2
38. Which of the alleles is most likely to be recessive?
A allele A B allele B C allele i D none
39. Which blood group would not appear in any child from father 2?
