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Edexcel IGCSE Biology respiration

Use respiration evidence across plant, animal and practical contexts: balance equations, calculate gas-use rates and explain anaerobic recovery.

Syllabus
First assessment 2019
Course
Biology 4BI1

Exam points

  • Write or balance aerobic and anaerobic respiration equations using correct products.
  • Calculate oxygen use or carbon dioxide production from tables, time, mass or ppm data.
  • Evaluate respirometer or seed investigations using controls, repeats and variables.

Covered syllabus points

2.34 Respiration and ATP2.35 ATP provides energy for cells2.36 Aerobic and anaerobic respiration2.37 Aerobic respiration equations2.38 Anaerobic respiration equations2.39 Respiration products practical

(f) Respiration question 1

[Maximum number: 5]

Aerobic respiration uses oxygen and produces ATP.

Question (a)

(a)

Complete the word equation for aerobic respiration.
oxygen + ⟶ + + ATP

[ 2 ]

Question (b)

(b)

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 (b) — Edexcel IGCSE Biology

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

[ 3 ]

(f) Respiration question 2

[Maximum number: 2]

A scientist investigates the effect of exercise on breathing rate.
She measures the breathing rate in breaths per minute of two people, P and Q , every 5 minutes for 30 minutes.

This is her method.
- measure their breathing rate every 5 minutes while they exercise for 20 minutes
- measure their breathing rate every 5 minutes for a further 10 minutes while they recover from the exercise

The table shows her results.

Table for Question (f) Respiration question 2 — Edexcel IGCSE Biology

Explain why the breathing rates of persons P and Q remain high for five minutes after they have finished exercising.

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