Biology 9700/43 — May/June 2010
Cambridge A-Level · A Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Control and Coordination · (outdated) Crop Plants · Photosynthesis · Classification, Biodiversity and Conservation · (outdated) Aspects of Human Reproduction · (outdated) Biotechnology · +4 more
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.
Fig. 1.1 shows an American crocodile.
Fig. 1.1
The salinity of the water was thought to play a part in the distribution of the American crocodile.
Fig. 1.2 shows the number of American crocodile nest sites in areas with water of varying salinity in southern Florida.
Fig. 1.2
Describe the results shown in Fig. 1.2.
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.
The rest of this paper
9 more questions- Q2Control and Coordination · (outdated) Aspects of Human Reproduction8M
- Q3(outdated) Biotechnology15M
- Q4(outdated) Crop Plants · Photosynthesis15M
- Q5Selection and Evolution8M
- Q6Inheritance8M
- Q7Energy and Respiration16M
- Q8Genetic Technology · (outdated) Crop Plants8M
- Q9Photosynthesis15M
- Q10Control and Coordination15M