Passage V

Some oceanic shrimp are vertical migrators. For vertically migrating species, most of the population is found at the bottom of their depth range during the day and at the top of their depth range at night. Table 1 shows the depth ranges and water, protein, lipid, and carbohydrate content of 3 vertically migrating (vm) species of shrimp and 3 nonmigrating (nm) species of deep-sea shrimp. Figure 1 shows water temperature and oxygen partial pressure at various ocean depths.

27. Assume that only oxygen partial pressure limits the range of the shrimp species shown in Table 1. Accordingly, which of the following pieces of information supports the hypothesis that vm 2 and vm 3 cannot tolerate oxygen partial pressures below 25 mm Hg ?

Answer and Explanation

Your Answer is

Correct Answer is C

Explanation

It can be seen from figure1 that when the abscissa oxygen partial pressure is 25, the ordinate depth is about 800 m;

It can be seen from table 1 that both vm 2 and vm 3 live at a depth of 400 m The area above m, so neither vm 2 nor vm 3 can bear the oxygen partial pressure of 25 mm Hg