OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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Which tool is used to measure light levels along a transect?

A thermometer
A spectrophotometer
A light meter
A ruler

The correct answer is: A light meter

A light meter is specifically designed to measure the intensity of light. In ecological studies, particularly when conducting a transect, researchers assess the amount of light available at different points to understand its effect on plant growth and distribution. The light meter provides precise readings of light levels, enabling scientists to compare how light intensity varies in different environments along the transect. This is crucial in studies of photosynthesis and energy flow within ecosystems. The alternatives serve different purposes: a thermometer measures temperature, a spectrophotometer assesses the absorbance of light by substances, and a ruler is used for measuring distance or length. None of these tools effectively measure light intensity like a light meter does.