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Difficulty: HardEcological Factors and Their Measurement

An ecologist investigated abiotic parameters across a transitional estuarine ecosystem. To evaluate environmental factors, the following instruments were deployed:

- Device I: A circular plate with alternating black and white quadrants, lowered into the water column until it was no longer visible to record light penetration depth.
- Device II: A pair of thermometers—one dry and one with a moistened bulb wrapper—used to calculate atmospheric moisture saturation.
- Device III: An instrument fitted with rotating hemispherical cups attached to a central vertical shaft to record atmospheric movement velocity.

Which option correctly identifies Devices I, II, and III along with the respective ecological factors they measure?

  1. Device I: Secchi disc measuring turbidity; Device II: Psychrometer measuring relative humidity; Device III: Anemometer measuring wind speedAnswer
  2. B
    Device I: Hydrometer measuring water density; Device II: Anemometer measuring relative humidity; Device III: Barometer measuring wind speed
  3. C
    Device I: Secchi disc measuring water density; Device II: Barometer measuring relative humidity; Device III: Wind vane measuring wind speed
  4. D
    Device I: Rain gauge measuring precipitation depth; Device II: Psychrometer measuring temperature; Device III: Anemometer measuring wind direction

Answer

Device I is a Secchi disc (measuring turbidity/light penetration depth), Device II is a psychrometer (measuring relative humidity), and Device III is an anemometer (measuring wind speed).
The option identifying Device I as a Secchi disc measuring turbidity, Device II as a psychrometer measuring relative humidity, and Device III as an anemometer measuring wind speed is correct because each instrument's operating principle matches the described field procedure.

Step-by-Step Solution

1
Analyze Device I function
A circular plate with black and white quadrants lowered into water to measure light penetration depth is a Secchi disc, which quantifies water turbidity.
Secchi discs measure the depth of light penetration in aquatic habitats.
2
Analyze Device II function
A paired dry-bulb and wet-bulb thermometer setup used to measure moisture content in the atmosphere is a psychrometer (or wet-and-dry bulb hygrometer), which determines relative humidity.
Evaporative cooling on the wet bulb creates a temperature difference used to find humidity percentages.
3
Analyze Device III function
An instrument with rotating hemispherical cups driven by air movement measures wind speed and is called an anemometer.
The rotation speed of the cups corresponds directly to wind velocity.
4
Synthesize and match options
Matching all three instruments yields Secchi disc (turbidity), psychrometer (relative humidity), and anemometer (wind speed).
Only the combination pairing Secchi disc, psychrometer, and anemometer accurately attributes all three instruments and their measured factors.

Key Concept

Ecological Factors and Their Measurement
Estimated Time:2m 0s
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Topics

Ecological Factors and Their Measurement

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