Edexcel IGCSE Biology 2.34 Respiration and Atp Questions

Compare respiration rates per gram using body size and surface-area-to-volume ratio, then trace how waterlogged soil reduces oxygen, respiration and mineral-ion uptake.

Exam points

Explain why small animals use more oxygen per gram by linking body size, surface-area-to-volume ratio and heat loss to respiration.
Explain how waterlogged soil reduces root respiration, active transport and mineral uptake.

[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 Edexcel IGCSE Biology 2.34 Respiration and Atp Questions question 1 — Edexcel IGCSE Biology

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

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Edexcel IGCSE Biology 2.34 Respiration and Atp Questions question 1