The Ecology of Populations: JAMB Biology Questions, Answers & Notes

What The Ecology of Populations covers in the JAMB Biology syllabus

A population is all the individuals of one species in an area; the different populations together form a community. Population density is the number per unit area. Populations grow with high birth rate and immigration, and shrink with high death rate and emigration; growth is limited by food shortage, disease, predation and competition, and cannot long exceed the environment's carrying capacity — giving an S-shaped (sigmoid) growth curve. An organism's role in its habitat is its niche, and the total dry mass of organisms is the biomass. Populations are estimated using the quadrat method (plants/slow animals) and the mark-recapture method (mobile animals).

For The Ecology of Populations, JAMB expects you to be able to:

• Define population, community, density, niche, biomass and carrying capacity
• Explain factors that change population size and the sigmoid growth curve
• Describe methods of estimating populations (quadrat, mark-recapture)

Key facts & revision notes: The Ecology of Populations

These are the recurring points our The Ecology of Populations questions test — revise them until each feels automatic, then practise the questions above to lock them in.

• A population is all the individuals of the same species in a given area at a given time.
• Population density is the number of individuals per unit area (or volume).
• A community is made up of the different populations interacting in an area.
• The quadrat method is used to estimate populations of plants and slow-moving animals.
• Mark-recapture (capture, mark, release, recapture) estimates populations of mobile animals.
• Populations grow with high birth rate and immigration (arrivals).
• Populations fall with high death rate and emigration (departures).
• Immigration is the movement of individuals into a population; emigration is out of it.
• Carrying capacity is the largest population an environment can sustain with its resources.
• Beyond carrying capacity, shortage of resources causes the population to fall.
• Population growth is limited by food shortage, disease, predation and competition.
• An ecological niche is the role and position of an organism in its environment.
• Population growth typically follows an S-shaped (sigmoid) curve, levelling off at carrying capacity.
• Biomass is the total dry mass of living material in a given area.
• Competition for a shared limited resource limits the growth of the competing populations.
• Predators, disease and food shortage act as natural checks on rapid population growth.
• The birth (natality) rate is the number of births per unit population per time.
• Density = number counted ÷ area = 5 ÷ 1 = 5 plants per m².
• A stable population has births + immigration balanced by deaths + emigration.
• Abundant food and few predators favour population growth.
• Population size is the number of individuals present.
• Emigration is movement out of a population.
• Natality is the birth rate.
• Mortality is the death rate.

Worked examples

Three The Ecology of Populations questions with the answer and a short explanation, so you can see how the topic is set before you practise the full set.

How The Ecology of Populations is tested in JAMB Biology

Our The Ecology of Populations bank holds 40 questions (2 easy, 23 medium, 15 hard). JAMB Biology typically returns to The Ecology of Populations year after year, so steady practice on this topic is high-value revision. Questions are multiple-choice with four options, and at UTME pace you get roughly 40 seconds each — which is why timed practice matters.

How to answer The Ecology of Populations questions

Work the stem first and predict the answer before you look at the options; then eliminate the ones that contradict the key facts above. Watch for “which is not…”, “all of the above” and “except” style stems, which are where rushed candidates lose easy marks on The Ecology of Populations. If a calculation or a precise definition is involved, work it from first principles rather than guessing from a half-remembered rule. When two options look right, re-read the stem for the qualifier that separates them — JAMB rarely repeats an option by accident. If you are still unsure, eliminate the two weakest choices to lift your odds, flag the question, and move on; never burn a full minute on one Biology item when the exam gives you about forty seconds each. Then come back to flagged questions with whatever time remains. The single most reliable way to get faster at The Ecology of Populations is repeated timed practice, so use the button above until the recurring patterns feel automatic.

Common mistakes to avoid in The Ecology of Populations

The errors that cost marks on The Ecology of Populations are usually careless rather than conceptual: misreading a negative stem, confusing two similar terms, or rushing a definition you actually know. Candidates also over-rely on “expo” and last-minute cramming instead of understanding the topic — which fails the moment JAMB rephrases a familiar idea. Treat every option as a claim to be checked against the facts above, keep your working tidy for any calculation, and don’t change a considered answer on a hunch. Above all, revise The Ecology of Populations actively by answering questions, not just by re-reading notes — recall under time is what the exam rewards.

Frequently asked questions

Is The Ecology of Populations part of the JAMB Biology syllabus?

Yes. The Ecology of Populations is a recognised topic in the JAMB Biology syllabus, covering define population, community, density, niche, biomass and carrying capacity. You should be able to recall its key facts and apply them to multiple-choice questions.

How many The Ecology of Populations questions can I practise on Belmadeng?

There are 40 original, JAMB-standard The Ecology of Populations questions in our free bank, each with the correct answer and a worked explanation. You can practise them untimed or as a timed test.

What are the most important points to know about The Ecology of Populations?

A population is all the individuals of one species in an area; the different populations together form a community. Population density is the number per unit area. Populations grow with high birth rate and immigration, and shrink with high death rate and emigration; growth is limited by food shortag…

How do I answer The Ecology of Populations questions quickly in JAMB?

Read the stem carefully, eliminate clearly wrong options, and match the remaining choices to the key facts for The Ecology of Populations. Practising timed The Ecology of Populations questions builds the speed you need for UTME's pace of about 40 seconds per question.

Are these JAMB Biology The Ecology of Populations questions past questions or original?

They are original questions written to JAMB (UTME) standard and mapped to the official syllabus — not reproduced past papers. This keeps them legal to use freely while closely mirroring how the real exam tests the topic.

Where can I practise The Ecology of Populations questions free without signing up?

Right here — tap “Start The Ecology of Populations practice” on this page to begin instantly. Belmadeng's CBT practice is completely free and needs no sign-up, download or subscription.

About these questions: original, JAMB-standard items written from the official UTME Biology syllabus (last reviewed 2026-09-18). Belmadeng is an independent study platform and is not affiliated with JAMB. Spotted an error? Use the report link.