{"id":"act_quizme:science:q3:05","source_id":"act_quizme","source_item_id":"science-q3-05","external_id":"fab811c7166274f8","program":"ACT","section":"science","category_code":null,"category":null,"subcategory_code":null,"subcategory":null,"form_id":null,"passage_id":"act_quizme:science:q3:passage","position":5,"scored":true,"layout_warning":null,"stem":"How many A. percula were placed in each of the tanks in Experiment 1?","stimulus":"","stimulus_html":null,"stem_html":"
\n

How many A. percula were placed in each of the tanks in Experiment 1?

\n
\n","rationale_html":"

A. Incorrect. The stocking density was 1 fish/L, but each tank contained 10 L of water.

B. Incorrect. The 12 tanks were divided into 4 groups, but 10 fish were placed into each tank. 

C. Correct. The description of Experiment 1 indicates that each tank received 10 L of seawater and that the stocking density for each tank was 1 fish/L. Therefore, 10 fish were placed in each tank in Experiment 1.

D. Incorrect. There were 12 tanks, but 10 fish were placed in each tank. 

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1

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4

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10

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16

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Amphiprion percula, a species of clownfish, are kept in many home aquariums. Two experiments were conducted to determine how diet and stocking density (number of fish per liter of seawater, fish/L) affect the specific growth rate (SGR; percent increase in length per day, percent/day) in A. percula.

\nExperiment 1\n

Each of 12 identical 15 L tanks received 10 L of seawater having a salinity of 33 parts per thousand (ppt), a temperature of 27° degrees C, and a pH of 8.2. Salinity, temperature, and pH were kept constant over the course of the experiment. A. percula of similar lengths were selected, and their lengths were measured, in cm, with a ruler. Then they were equally distributed among the tanks at a stocking density of 1 fish/L. The tanks were then divided equally into 4 groups.

\n

For 4 months, each group was fed a different diet (Diets Q–TQ through T). Each group was fed the same mass of food 3 times daily. At the end of 4 months, the length of each fish was measured, in cm, with a ruler, and the SGR of each fish was calculated. The average SGR was then determined for each group (see Table 1).

\nTable 1\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
DietAverage SGR
(percent/day)
Q0.30
R0.40
S0.50
T0.35
\nExperiment 2\n

The procedures for Experiment 1 were repeated except that each group was kept at a different stocking density, 0.5 fish/L, 1 fish/L, 2 fish/L, or 3 fish/L, and all fish were fed Diet T. At the end of 4 months, the average SGR was determined for each group (see Table 2).

\nTable 2\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Stocking density
(fish/L)		Average SGR
(percent/day)
0.50.50
10.35
20.25
30.20
\n

Tables adapted from João Chambel et al., “Effect of Stocking Density and Different Diets on Growth of Percula Clownfish, Amphiprion percula (Lacepede, 1802).” ©2015 by Springer.

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How many A. percula were placed in each of the tanks in Experiment 1?

","rationale_html":null,"correct_answer":["H"],"equiv_key":"1044d57aad4a061a2771e3b0","has_media":false,"has_mathml":false,"has_table":false,"section_label":"Science","attribution":{"source_id":"act_practice_pdf","source_name":"Official ACT full-length practice tests (PDF)","rights_holder":"ACT Education Corp.","canonical_url":"https://www.act.org/content/act/en/products-and-services/the-act/test-preparation.html","retrieved_from":"https://www.act.org/content/act/en/products-and-services/the-act/test-preparation.html","attribution":"Full-length ACT practice tests © ACT Education Corp., published free at act.org. Questions are retired items from previous ACT administrations.","disclaimer":"Extracted from a print-layout PDF: equations, figures and charts do not survive as text. Use the original PDF for anything that renders poorly. ACT® is a registered trademark of ACT Education Corp., which is not affiliated with, does not sponsor, and does not endorse this project.","license":"ACT Education Corp. copyright. Published free for personal test preparation; not licensed for redistribution.","redistributable":false,"item_count":342}}]}