ACT Science Practice Test 117

Directions: Each passage is followed by several questions. After reading a passage, choose the best answer to each question and fill in the corresponding oval on your answer document. You may refer to the passages as often as necessary.

You are NOT permitted to use a calculator on this test.


PASSAGE IV

Students wanted to test the effects of nutrition on the growth of guinea pigs. Two experiments were conducted using different feeds and vitamin supplements. For both experiments, four groups of 10 guinea pigs each were given a different type of feed over an 8-week period. Each group received the same quantity of food and was provided with fresh water daily. The guinea pigs were measured and weighed weekly. The guinea pigs in each group had an average starting weight of 50 grams (g) and an average starting length of 20 centimeters (cm).

Experiment 1

Group 1 was fed a high-protein feed (Feed P).

Group 2 was fed a grain-based feed with vitamin supplements (Feed Q).

Group 3 (control group) was fed a grain-based feed without supplements (Feed R).

Group 4 was fed a grain-based feed without supplements plus
fruits and vegetables (Feed S).

The results and average measurements are recorded in Table 1 below.

Experiment 2

Group 5 was fed a high-protein feed plus fruits and vegetables (Feed V).

Group 6 was fed a grain-based feed with vitamin supplements plus fruits and vegetables (Feed W).

Group 7 (control group) was fed a grain-based feed without supplements (Feed X).

Group 8 was fed a grain-based feed without supplements plus fruits only (Feed Y).

The results and average measurements are recorded in Table 2 below.

1. Based on the results of the experiments, which feed resulted in the greatest weight gain?

A. Feed P.
B. Feed S.
C. Feed V.
D. Feed Y.

2. Based on the results of Experiment 1, the guinea pigs in the group that was fed a grain-based feed with vitamins gained how much weight, on average, during each week of the experiment?

F. 29 grams.
G. 11 grams.
H. 10 grams.
J. 4 grams.

3. If the students added vitamin supplements to Feed V for a new group (Group 9), what might the result be after 8 weeks?

A. The guinea pigs in Group 9 would weigh less than those in Group 5.
B. The guinea pigs in Group 9 would weigh less than those in Group 6.
C. The guinea pigs in Group 9 would have a greater average length than those in Group 5.
D. The guinea pigs in Group 9 would have a shorter average length than Group 6.

4. Which of the following statements is true, according to Table 2?

F. Feed W produces guinea pigs that are almost twice as long as those in the control group.
G. Feed V produces guinea pigs that weigh three times as much as those in the control group.
H. Feed Y produces guinea pigs with the greatest average length.
J. Feed X produces guinea pigs similar to those produced by Feed Y.

5. From the results of the experiments the students would hypothesize that the guinea pigs in Groups 3 and 4 are similar because:

A. the control group was fed larger quantities of food.
B. the fruits and vegetables given in Experiment 1 did not have a very high nutritional value.
C. neither group received enough high-protein food.
D. the vitamin supplements given in Experiment 2 were more potent than those given in Experiment 1.

6. According to the passage, the guinea pigs in which of the following groups showed the least overall growth?

F. Group 8.
G. Group 7.
H. Group 4.
J. Group 1.