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CAIE IGCSE Biology 12.1 Respiration Questions

Practise respiration-and-energy questions on energy uses in organisms, passive-process distractors, respirometer rates and temperature effects.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • identify muscle contraction, protein synthesis, cell division, active transport and growth as energy uses
  • recognise nerve impulses and constant body temperature as further respiration-energy uses
  • distinguish respiration-powered processes from passive diffusion, osmosis and transpiration
  • calculate respiration rate from gas-volume change or a respirometer graph gradient over time
  • predict respiration rate rising to an optimum before falling at higher temperatures
  • explain temperature effects using enzyme denaturation, kinetic energy, effective collisions and oxygen diffusion

Covered syllabus points

12.1.1—Uses of energy in living organisms12.1.2—Effect of temperature on respiration

Question 1

[Maximum number: 1]

These are processes that occur in plants.

1 active transport
2 cell division
3 osmosis
4 transpiration

Which processes use energy from respiration?

A

1 and 2

B

1 and 4

C

2 and 3

D

3 and 4

Question 2

[Maximum number: 1]

What is the effect on germinating seeds of increasing the temperature from 10∘C10^{\circ} \mathrm{C} to 20∘C20^{\circ} \mathrm{C} ?

A

a decrease in the production of oxygen

B

a decrease in the respiration rate

C

an increase in the respiration rate

D

an increase in the transpiration rate

Question 3

[Maximum number: 1]

Which actions use energy released from respiration?
1 muscle contraction
2 protein synthesis
3 cell division
4 transmitting nerve impulses

A

1, 2, 3 and 4

B

1, 2 and 4 only

C

2 and 3 only

D

3 and 4 only

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