Factors Affecting the Distribution of Organisms: JAMB Biology Questions, Answers & Notes

What Factors Affecting the Distribution of Organisms covers in the JAMB Biology syllabus

Ecology studies organisms in relation to their environment. Environmental factors are abiotic (non-living: temperature, light, water, wind), biotic (living: predators, competitors, parasites), edaphic (soil: type, pH, moisture) and climatic (rainfall, temperature, humidity). These determine where organisms live — for example rainfall and temperature decide whether an area is desert, forest or grassland, and dissolved oxygen limits aquatic life. A limiting factor restricts a population's growth or distribution. Ecological terms: habitat (where an organism lives), population (one species in an area), community (all species together), ecosystem (community + abiotic environment). Instruments: thermometer, hygrometer, anemometer, rain gauge.

For Factors Affecting the Distribution of Organisms, JAMB expects you to be able to:

• Distinguish abiotic, biotic, edaphic and climatic factors
• Explain how environmental factors and limiting factors affect distribution
• Define ecological terms and identify instruments for measuring factors

Key facts & revision notes: Factors Affecting the Distribution of Organisms

These are the recurring points our Factors Affecting the Distribution of Organisms questions test — revise them until each feels automatic, then practise the questions above to lock them in.

• Ecology is the study of organisms in relation to one another and their environment.
• Abiotic factors are the non-living parts of the environment (e.g.
• temperature, light, water).
• Biotic factors are the living parts of the environment (plants, animals, microorganisms).
• Temperature is an abiotic (non-living) factor; the others are biotic.
• Edaphic factors are soil-related factors (soil type, pH, moisture) affecting distribution.
• Climatic factors include rainfall, temperature, light, humidity and wind.
• A habitat is the natural home or place where an organism lives.
• A thermometer measures temperature; a hygrometer measures humidity; an anemometer measures wind speed.
• An anemometer measures wind speed.
• A hygrometer measures the humidity (water vapour) of the air.
• A rain gauge measures the amount of rainfall.
• Rainfall and temperature are the key climatic factors shaping deserts, forests and grasslands.
• Competition occurs when organisms struggle for limited resources.
• Light is essential for photosynthesis, so it strongly influences where green plants grow.
• Deep-sea organisms are adapted to permanent darkness (and high pressure, cold).
• A limiting factor restricts the size, growth or distribution of a population.
• Soil pH is an edaphic (soil) factor affecting which plants can grow.
• For aquatic organisms, dissolved oxygen is a key factor limiting their distribution.
• An ecosystem is a community of organisms together with their non-living (abiotic) environment.
• A population is all the members of one species living in the same area at the same time.
• Factors are either biotic (living) or abiotic (non-living).
• Predators are living, so they are biotic.
• Rainfall and temperature are climatic factors.

Worked examples

Three Factors Affecting the Distribution of Organisms questions with the answer and a short explanation, so you can see how the topic is set before you practise the full set.

How Factors Affecting the Distribution of Organisms is tested in JAMB Biology

Our Factors Affecting the Distribution of Organisms bank holds 40 questions (3 easy, 25 medium, 12 hard). JAMB Biology typically returns to Factors Affecting the Distribution of Organisms 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 Factors Affecting the Distribution of Organisms 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 Factors Affecting the Distribution of Organisms. 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 Factors Affecting the Distribution of Organisms is repeated timed practice, so use the button above until the recurring patterns feel automatic.

Common mistakes to avoid in Factors Affecting the Distribution of Organisms

The errors that cost marks on Factors Affecting the Distribution of Organisms 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 Factors Affecting the Distribution of Organisms actively by answering questions, not just by re-reading notes — recall under time is what the exam rewards.

Frequently asked questions

Is Factors Affecting the Distribution of Organisms part of the JAMB Biology syllabus?

Yes. Factors Affecting the Distribution of Organisms is a recognised topic in the JAMB Biology syllabus, covering distinguish abiotic, biotic, edaphic and climatic factors. You should be able to recall its key facts and apply them to multiple-choice questions.

How many Factors Affecting the Distribution of Organisms questions can I practise on Belmadeng?

There are 40 original, JAMB-standard Factors Affecting the Distribution of Organisms 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 Factors Affecting the Distribution of Organisms?

Ecology studies organisms in relation to their environment. Environmental factors are abiotic (non-living: temperature, light, water, wind), biotic (living: predators, competitors, parasites), edaphic (soil: type, pH, moisture) and climatic (rainfall, temperature, humidity). These determine where or…

How do I answer Factors Affecting the Distribution of Organisms questions quickly in JAMB?

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

Are these JAMB Biology Factors Affecting the Distribution of Organisms 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 Factors Affecting the Distribution of Organisms questions free without signing up?

Right here — tap “Start Factors Affecting the Distribution of Organisms 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.