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Edexcel IGCSE Biology 2.34 Respiration & ATP

Practise linking respiration to ATP demand using oxygen-use calculations, body-mass data, surface area graphs and plant-root growth contexts.

Syllabus
First assessment 2019
Course
Biology 4BI1

Exam points

  • calculate oxygen use from rate, body mass and time, giving the correct cm3 value
  • explain respiration rate per gram using body size, surface area and heat loss data
  • link low soil oxygen to reduced respiration, active transport and mineral uptake

2.34 Respiration and ATP question 1

[Maximum number: 3]

Aerobic respiration uses oxygen and produces ATP.

A scientist investigates the rates of aerobic respiration of some animals.

The scientist calculates the rate of respiration per gram of each animal.
The results are shown in the table.

Table for Question 2.34 Respiration and ATP question 1 — Edexcel IGCSE Biology

Explain why a mouse uses more oxygen per gram than a human.

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