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Population size and factors affecting it
Practice Questions

20 CIE IGCSE Biology questions on Population size and factors affecting it, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Population size and factors affecting it

Question 1 · 1 mark · Difficulty 1/3

A scientist studying a bacterial population in a culture flask observed four phases: lag phase, exponential growth, stationary phase, and death phase. During which phase does the population size remain approximately constant?

  1. lag phase
  2. exponential growth phase
  3. stationary phase
  4. death phase
Show answer & explanation
✓ Answer: C — stationary phase
Award 1 mark for stationary phase. During this phase, the birth rate equals the death rate, so population size remains constant. A is incorrect because in the lag phase the population is adjusting and growing slowly. B is incorrect because exponential growth shows rapid increase. D is incorrect because the death phase shows population decline.
Question 2 · 1 mark · Difficulty 2/3

A study in Kenya tracked a population of wildebeest over 10 years. The graph showed that the population size fluctuated around 250,000 individuals, despite high birth rates. Which factor is most likely limiting this population?

  1. unlimited food supply
  2. absence of predators
  3. availability of water and grazing land
  4. lack of competition
Show answer & explanation
✓ Answer: C — availability of water and grazing land
Award 1 mark for availability of water and grazing land. When a population fluctuates around a stable size despite high birth rates, it indicates the population is at or near carrying capacity, limited by resources such as food, water and space. A is incorrect because unlimited food would allow continued growth. B is incorrect because absence of predators would also allow growth. D is incorrect because competition is present when resources are limited, and this is what maintains the population at carrying capacity.
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20 questions · 25 min · free

CIE IGCSE Biology: Population size and factors affecting it FAQ

How many CIE IGCSE Biology questions on Population size and factors affecting it are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Population size and factors affecting it for CIE IGCSE Biology, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CIE paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CIE IGCSE students preparing for Biology?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Population size and factors affecting it practice with other Biology topics or even switch to a totally different CIE subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Population size and factors affecting it questions aligned to the official CIE IGCSE Biology syllabus?
Every question is written against the published CIE IGCSE Biology specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CIE paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CIE.
How is Population size and factors affecting it typically tested on CIE IGCSE Biology papers?
Population size and factors affecting it appears across multiple question types on real CIE IGCSE Biology papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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