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A fruit fly consumes 0.3 g of oxygen in one day. How much oxygen does it consume per hour in milligrams? Show calculation.

easy 1 mark Class 7 · Science · Respiration in Organisms
Answer
12.5 mg/h

The correct answer is 12.5 mg/h — Divide the total milligrams by 24 hours: 300 mg ÷ 24 h = 12.5 mg/h.

Step-by-step solution

  1. Convert 0.3 g to milligrams: 0.3 g × 1000 mg/g = 300 mg.
  2. Divide the total milligrams by 24 hours: 300 mg ÷ 24 h = 12.5 mg/h.
Common mistake: forgetting to convert grams to milligrams

Concept tested: oxygen consumption rate

Published · How this solution was prepared and checked

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