Biology Higher Level Paper 1

1103 Words May 12th, 2013 5 Pages


Biology HigHer level PaPer 1 Wednesday 6 May 2009 (afternoon) 1 hour INSTRUCTIONS TO CANDIDATES
• Do not open this examination paper until instructed to do so. • Answer all the questions. • For each question, choose the answer you consider to be the best and indicate your choice on

the answer sheet provided.



18 pages © International Baccalaureate Organization 2009

– 2 – 1. What does the following scatter graph show? 16 14 12 10 Variable Y 8 6 4 2 0 0 2 4


6 8 10 12 14 16 Variable X

A. B. C. D.

No correlation between these variables Strong positive correlation between these variables Strong
…show more content…
B. C. D.

Both children are related to both parents. Child I is related to the man but child II is not. Both children are unrelated to either of the parents. Child II is related to the man but child I is not.



Turn over

– 8 –


15. Slime moulds (Acrasiomycota) are protoctists. They feed on decaying organic matter, bacteria and protozoa. Which of the terms describes their nutrition? A. B. C. D. I. II. Detritivore Autotroph

III. Heterotroph I only I and II only I and III only I, II and III

16. Several greenhouse gases occur in the atmosphere. Carbon dioxide (CO2 ) is one of them but so are methane (CH4 ) and oxides of nitrogen (NOx ). Why are oxides of nitrogen classed as greenhouse gases? A. B. C. D. They trap some of the long-wave radiation emitted by the Earth’s surface. They prevent short-wave radiation from reaching the Earth’s surface. They dissolve in rainwater to produce acid rain. They are only produced by human activity whereas CO2 and CH4 are also produced naturally.

17. What is the mechanism of natural selection? A. B. C. D. Any individuals in a population can be selected entirely by chance. After a change in the environment a species will evolve adaptations to the new conditions. If an adaptation to the environment is useful, an individual will develop it and pass it on to its offspring.

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