18.2. Biodiversity
A subsection of Biology, 9700, through 18. Classification, biodiversity and conservation
Listing 10 of 94 questions
The American crocodile, Crocodylus acutus, was classified as an endangered species by the USA in 1975. It is found in estuarine regions of southern Florida. shows an American crocodile. The salinity of the water was thought to play a part in the distribution of the American crocodile. shows the number of American crocodile nest sites in areas with water of varying salinity in southern Florida. number of nest sites 0-5 6-10 11-15 16-20 water salinity / parts per thousand 21-25 26-30 31-35 Describe the results shown in . Much conservation work has been done in the Everglades National Park in Florida, which is a large wetland area. As a result the number of nest sites has increased from 8 in 1975 to 31 in 2000. This has led to a rise in the number of crocodiles. Calculate the percentage increase in nest sites between 1975 and 2000. Show your working. answer % Suggest two reasons why the population of crocodiles in the Everglades National Park has increased. 1. 2.
9700_s10_qp_42
THEORY
2010
Paper 4, Variant 2
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The American crocodile, Crocodylus acutus, was classified as an endangered species by the USA in 1975. It is found in estuarine regions of southern Florida. shows an American crocodile. The salinity of the water was thought to play a part in the distribution of the American crocodile. shows the number of American crocodile nest sites in areas with water of varying salinity in southern Florida. number of nest sites 0-5 6-10 11-15 16-20 water salinity / parts per thousand 21-25 26-30 31-35 Describe the results shown in . Much conservation work has been done in the Everglades National Park in Florida, which is a large wetland area. As a result the number of nest sites has increased from 8 in 1975 to 31 in 2000. This has led to a rise in the number of crocodiles. Calculate the percentage increase in nest sites between 1975 and 2000. Show your working. answer % Suggest two reasons why the population of crocodiles in the Everglades National Park has increased. 1. 2.
9700_s10_qp_43
THEORY
2010
Paper 4, Variant 3
View
Questions Discovered
94