Lesson eLearning

A 10‑hectare forest in the Deccan absorbs 900 tonnes of CO₂ annually. Calculate the amount of CO₂ absorbed per square metre per year, in kilograms.

hard 3 marks Class 7 · Science · Forests - Our Lifeline
Answer
9 kg/m²

The correct answer is 9 kg/m² — Divide the total CO₂ by the area: 900,000 kg ÷ 100,000 m² = 9 kg/m² per year.

Step-by-step solution

  1. Convert hectares to square metres: 1 ha = 10,000 m²; hence 10 ha = 100,000 m².
  2. Convert tonnes to kilograms: 1 tonne = 1,000 kg; hence 900 tonnes = 900,000 kg.
  3. Divide the total CO₂ by the area: 900,000 kg ÷ 100,000 m² = 9 kg/m² per year.
Common mistake: Using hectares incorrectly

Concept tested: CO₂ absorption calculation

Published · How this solution was prepared and checked

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