Ijmb Model Questions Vol1 2025 Biology Question 4

Practice practical question 4 from the 2025 Ijmb Model Questions Vol1 Biology examination. This question covers Respiration .

Ijmb Model Questions Vol1 2025 Biology Practical

Topic: Respiration

Question 4 IJMB_MODEL_QUESTIONS_VOL1 • 2025 • BIOLOGY • practical

A group of students investigates the effect of metabolic inhibitors on the rate of cellular respiration in germinating pea seeds using a sealed gas syringe to collect the CO₂ evolved over 30 minutes.

Question Parts

( a )

Describe the experimental set‑up, including the preparation of the pea samples, the gas‑syringe system and the method of recording CO₂ volume.

( b )

Given the CO₂ volumes recorded after 30 min are: control = 12.5 mL, sodium azide = 4.2 mL, cyanide = 2.8 mL, calculate the respiration rate in mL CO₂ g⁻¹ min⁻¹ for each treatment.

( c )

Determine the percent inhibition of respiration for each inhibitor relative to the control.

( d )

Explain why cyanide produces a greater inhibition of respiration than sodium azide under the conditions of this experiment.

Detailed Solution & Marking Scheme

Get the step-by-step solution, key points required by examiners and detailed marking guidance through the Edcrib AI Tutor.

Reveal Answer

About This Question

This is Ijmb Model Questions Vol1 2025 Biology Question 4. It is one of the practical questions from the 2025 Ijmb Model Questions Vol1 Biology examination.

The question covers Respiration .

View More Ijmb Model Questions Vol1 2025 Biology Questions More Ijmb Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows

Chat with Support