Biology 9700 · AS & A Level · Conservation

Conservation — practice question

The American crocodile, Crocodylus acutus, was listed as an endangered species in the USA in 1975. It occurs in estuarine areas of southern Florida. Fig. 1.1 shows an American crocodile. The salinity of the water was believed to influence the distribution of the American crocodile.
(a)[3]

Describe the pattern shown in Fig. 1.2.

(b(i))[2]

Calculate the percentage increase in nest sites from 1975 to 2000. Show your working.

(b(ii))[2]

Suggest two reasons why the crocodile population in Everglades National Park has risen.

Worked solution & mark scheme

This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: More nests in places with low salinity / less saline areas

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