ACT Science Practice 1

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1.In which of Studies 1 and 2 did some of the fruit flies live for more than 75 days, and what diet were those fruit flies fed? *

1 point

Study 1; 05% SY medium

Study 1; 15% SY medium

Study 2; 05% SY medium

Study 2; 15% SY medium

2. During Studies 1 and 2, why did the size of the fruit fly population in each tube decrease rather than increase?

1 point

The birthrate was 0, because the initial population contained only in males.

The birthrate was 0, because the initial population contained only in virgin females

The death rate was 0, because the initial population contained only males.

The death rate was 0, because the initial population contained only virgin females.

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3. Study 1 differed from Study 2 in which of the following ways?

1 point

Female fruit flies were tested in Study 1, whereas males fruit flies were tested in Study 2

Male fruit flies were tested in Study 1, whereas female fruit flies were tested in Study 2

The SY medium tested in Study 1 contained a lower percent of sugar than did the SY medium tested in Study 2

The SY medium tested in Study 1 contained a higher percent of sugar than did the SY medium tested in Study 2

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4. Suppose that an additional trial in Study 3 had been performed using a 12% SY medium (a diet with 12% sugar and 12% killed yeast). The average lifespan of the Strain X fruit flies in this trial would most likely have been:

1 point

less than 55.6 days

between 55.6 days and 58.6 days.

between 58.6 days and 61.6 days.

greater than 61.6 days.

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5. The researchers had predicted that decreasing a fruit fly’s ability to detect odors would increase its lifespan. Are the results of Study 3 consistent with this prediction?

1 point

No; for each SY medium tested, the average life span of Strain X fruit flies was longer than the average life span of Strain N fruit flies

No; for each SY medium tested, the average life span of Strain N fruit flies was longer than the average life span of Strain X fruit flies.

Yes; for each SY medium tested, the average life span of Strain X fruit flies was longer than the average life span of Strain N fruit flies.

Yes; for each SY medium tested, the average life span of Strain N fruit flies was longer than the average life span of Strain X fruit flies

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6. Suppose the researchers wanted to determine whether a defect in the ability to detect odors would change the life span of fruit flies fed 15% SY medium when live yeast is added to the diet or when additional odors from live yeast are added to the diet. Which of the following experiments should be performed?

1 point

Repeat Study 1 except with Strain X fruit flies

Repeat Study 1 except with Strain N fruit flies

Repeat Study 2 except with Strain X fruit flies

Repeat Study 2 except with Strain N fruit flies

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