Passage IV
A study was conducted to determine whether two test kits (Kit A and Kit B) provided reliable data on the content of water samples of varying salinity (salt concentration). The concentrations of several compounds commonly tested for in water samples were measured. The results are presented in the table below. The results for the test kits were compared to estimates obtained using Standard Methods, which provide extremely accurate estimates.
Table adapted from Claude E. Boyd and Harry V. Daniels, "Evaluation of Hach Fish Farmer's Water Quality Test Kits for Saline Water." ©1988 by the World Aquaculture Society.
22. Which of the following graphs best represents the relationship between the level of salinity and the concentration of dissolved CO2, as estimated by Kit A ?
Your Answer is
Correct Answer is H
Explanation
Find the big row of CO2 in the table, and locate the small row of Kit A. From left to right, Salinity increases sequentially, the first four data of dissolved CO2 concentration keep decreasing, and the last group has a big increase, which conforms to H option.