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19. Organisms and their environment
A section of Biology, 0610
Listing 10 of 662 questions
For Examiner's Use Daphnia is a small arthropod animal found in freshwater. The population of Daphnia in a lake in Oregon (in the northern temperate region) was sampled at regular intervals between March and November in 2006 and 2007. During 2006 there were very few Daphnia in any of the samples. At the end of that year fish were removed from the lake. • The population of Daphnia in March, April and May 2007 was 1 animal per m3 of water sampled. • The population then increased exponentially to 100 000 per m3 at the beginning of July. • By the end of August the population had decreased to 10 000 per m3 and the population remained at this number until the end of November. Sketch a line on to show the population of Daphnia from March to the end of November 2007. Mar Nov Oct Sept Aug July June May Apr 100 000 10 000 numbers of Daphnia per m3 For Examiner's Use Suggest why there were very few Daphnia present in the lake in 2006. Explain the changes in the population of Daphnia in 2007.
0610_w10_qp_31
THEORY
2010
Paper 3, Variant 1
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Questions Discovered
662