MYP Biology Topic Habitat Revision Notes

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MYP Biology Topic Habitat Revision Notes | RevisionDojo

Written by official IB examiners

What Is a Habitat?

Definition

Habitat

The natural environment that provides the resources and conditions an organism needs to survive and reproduce.

A habitat is the specific environment where an organism lives, grows, and reproduces.
It includes abiotic (nonliving) and biotic (living) factors that determine whether a species can survive there.
Each species occupies habitats where conditions fall within its tolerance range, the limits it can survive and function.

Common Mistake

Habitat is the place an organism lives.
Niche is the role: how it uses resources and interacts with other organisms.

What Abiotic Factors Define a Habitat?

Definition

Abiotic factors

Nonliving environmental conditions such as temperature, light, pH, and moisture.

Abiotic factors shape the physical conditions of an environment.
An organism can only survive where these conditions fall within its tolerance range.

Key abiotic factors

Temperature: affects enzyme activity and metabolic rate.
Light intensity: controls photosynthesis in plants and behaviour in animals.
Moisture levels: determine water availability for survival and reproduction.
pH: influences nutrient absorption and chemical reactions in soil or water.
Oxygen availability: essential for aerobic respiration.
Salinity: affects water balance in aquatic organisms.
Soil composition: determines nutrient levels and root stability.

Example

Fish require sufficient dissolved oxygen.
Desert plants survive because they tolerate extremely low moisture.

Common Mistake

Abiotic factors do not act alone.
Temperature + moisture together define deserts, not temperature alone.

What Biotic Factors Shape a Habitat?

Definition

Biotic factors

Interactions with living organisms, such as food availability, predators, competitors, and symbiotic partners.

Biotic factors involve interactions among organisms.
These determine population sizes, behaviour, and where organisms can live.

Key biotic factors

Food availability: limits population size and distribution.
Predation: influences behaviour and habitat choice.
Competition: occurs when species need the same resource.
Mutualism: both organisms benefit (e.g., bees pollinating flowers).
Parasitism: one organism benefits at the other's expense.

Tip

Biotic factors often change more quickly than abiotic ones, causing shifts in population patterns.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

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Note

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Tip

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MYP Biology Habitat Notes

What Is a Habitat?

What Abiotic Factors Define a Habitat?

Key abiotic factors

What Biotic Factors Shape a Habitat?

Key biotic factors

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Duis aute irure dolor in reprehenderit

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What Is a Habitat?

What Abiotic Factors Define a Habitat?

Key abiotic factors

What Biotic Factors Shape a Habitat?

Key biotic factors

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Cells7 subtopics

Organisms7 subtopics

Processes10 subtopics

Metabolism4 subtopics

Evolution7 subtopics

Interactions with environment6 subtopics

Interactions between organisms5 subtopics

Human interactions with environments3 subtopics

Biotechnology3 subtopics

MYP Biology Habitat Notes

Cells7 subtopics

Organisms7 subtopics

Processes10 subtopics

Metabolism4 subtopics

Evolution7 subtopics

Interactions with environment6 subtopics

Interactions between organisms5 subtopics

Human interactions with environments3 subtopics

Biotechnology3 subtopics

What Is a Habitat?

What Abiotic Factors Define a Habitat?

Key abiotic factors

What Biotic Factors Shape a Habitat?

Key biotic factors

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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What Is a Habitat?

What Abiotic Factors Define a Habitat?

Key abiotic factors

What Biotic Factors Shape a Habitat?

Key biotic factors

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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