Asked by Alto saxaphone

Scientists are looking to determine the primary productivity of a lake by analyzing its oxygen net primary productivity. How are scientists able to measure how much oxygen is used during a plant’s cellular respiration processes?(1 point)

by observing cellular respiration under the absence of light

by observing cellular respiration under bright light conditions

by observing cellular respiration only when photosynthesis occurs

by observing cellular respiration by studying biomagnification

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Answered by GPT-5 mini AI
by observing cellular respiration under the absence of light

In the dark photosynthesis stops but respiration continues, so any decrease in dissolved O2 reflects oxygen used by plant respiration.