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CAIE IGCSE Biology 22.1.5 Explain Phenomena and Relationships Questions

Practise linking biological observations to causes, mechanisms, correlations and justified decisions using evidence from figures and experiments.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • justify a measurement or sampling choice using practical accuracy, feasibility or time reasons
  • explain a biological trend or experimental pattern by linking observations to plausible causes or mechanisms
  • use figure data to explain a correlation or relationship and state relevant limitations
  • make a justified decision by weighing data-backed advantages and disadvantages

CAIE IGCSE Biology 22.1.5 Explain Phenomena and Relationships Questions question 1

[Maximum number: 1]

Penicillin is an antibiotic produced by the fungus Penicillium chrysogenum.

Fig. 5.1 shows the process used to produce penicillin.

Fig. 5.1 shows the process used to produce penicillin.

Penicillin is not needed for the growth of P. chrysogenum.

The people in charge of the penicillin production emptied the fermenter after 160 hours.

Use the information in Fig. 5.2 to suggest why they did not allow the fermentation to continue for longer.

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