The speed of wind can be measured with an instrument called

Step 1: Analyze the question The question asks which instrument measures wind speed. Each option is a measuring instrument, so we match each to what it measures.

Step 2: Explain the concept Instruments in ecology and physical geography each measure a specific environmental factor:

• Anemometer: wind speed (usually a set of rotating cups that spin faster as the wind gets stronger)
• Barometer: atmospheric pressure
• Hygrometer: humidity (moisture in the air)
• Photometer: light intensity
• Thermometer: temperature

Step 3: Solution Wind speed is the quantity we want, and the only instrument designed for it is the anemometer. The name comes from the Greek word anemos, meaning "wind".

The other options measure different factors:

• B measures air pressure, not wind movement
• C measures how much water vapour is in the air
• D measures brightness of light
• E measures how hot or cold something is

Step 4: Answer The correct option is A. anemometer.

Step 5: Exam tip Link the "-meter" prefix to what is measured:

• Anemo = wind
• Baro = pressure
• Hygro = moisture
• Photo = light
• Thermo = heat

If you remember that "anemo" means wind, you will never mix it up. Well done for practising past questions. Keep going!