Dissolved Oxygen (DO) Is an Important Indicator of Water Quality

question 359

Multiple Choice

Dissolved oxygen (DO) is an important indicator of water quality, and oxygen levels that are too high or too low can harm aquatic ecosystems. A biologist noticed that fish were dying in a local lake and was concerned that the DO levels were too low to support aquatic life due to extremely high temperatures that summer. To measure the DO levels, she brought back several lake water samples to her laboratory to measure the DO concentration as a function of temperature. To do this, she heated several samples of lake water to various temperatures and then measured the DO concentration in each sample. Some samples were kept at the outdoors temperature.
Which is the dependent variable?

• A)Temperature
• B)Volume of water
• C)The season
• D)Dissolved oxygen concentration

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Definitions:

Quality Checks

Procedures or measures taken to ensure that a product or service meets certain standards of quality and is free of defects.

Hierarchy

An organized system where people or parties are classified in a sequence based on their authority or prestige.

Pyramid

A structure or organization shaped in a pyramid form, often used metaphorically to describe hierarchical systems.

Horizontal Design

An organizational structure that focuses on teamwork and collaboration, minimizing hierarchical levels.