Adaptations — AQA GCSE Combined Science
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Adaptations explained
An adaptation is a feature that increases an organism's chance of survival and reproduction in its environment.
Read the full explanation
Adaptations may be structural, such as a camel's hump storing fat; behavioural, such as migration; or functional, such as reduced water loss through leaves. To explain an adaptation, name the feature, state the advantage it gives and link it to survival or reproduction in that habitat. For example, a polar bear's thick fur reduces heat loss, so it stays warm in Arctic conditions and can hunt. Given information, select the relevant adaptation and explain its benefit rather than simply describing it. Consider how the adaptation helps the organism compete for resources or avoid predators and disease.
Organisms have features (adaptations) that enable them to survive in the conditions in which they normally live. These adaptations may be structural, behavioural or functional.
An adaptation is any inherited feature that raises an organism's chance of surviving and reproducing in its habitat. Structural adaptations are body parts, such as a polar bear's thick fur and small ears reducing heat loss, or a cactus's spines reducing water loss and deterring herbivores. Behavioural adaptations are actions, such as migrating, hibernating or basking in the sun. Functional adaptations are internal processes, such as reduced sweating, concentrated urine or venom production. Because habitats differ in temperature, water, light and predators, the features that help in one place may be useless elsewhere. When explaining an adaptation, name the feature, state the challenge it addresses and link it to survival or reproduction, for example: streamlined shape reduces drag, so the organism escapes predators more easily.
Some organisms live in environments that are very extreme, such as at high temperature, pressure, or salt concentration. These organisms are called extremophiles. Bacteria living in deep sea vents are extremophiles.
Extremophiles are organisms adapted to survive where conditions would kill most life, including very high temperature, very high pressure or very high salt concentration. Deep sea vent bacteria live where superheated water rich in dissolved minerals escapes from the ocean floor, so they experience high temperature and high pressure with no sunlight. Their enzymes and cell structures remain stable under these conditions, and many obtain energy by chemosynthesis, using chemicals such as hydrogen sulfide instead of light. Other examples include salt-loving microbes in salt lakes and heat-loving microbes in hot springs. When answering, name the extreme condition, identify the organism as an extremophile and explain the adaptation that allows it to tolerate that condition, such as heat-stable enzymes or a cell membrane that resists high salt.
Your focus
- Identify structural, behavioural and functional adaptations from given information.
- Explain how a named adaptation increases an organism's chance of survival or reproduction.
- Apply adaptation ideas to organisms in different natural environments.
Show all 9 objectives
- State that adaptations are features enabling organisms to survive in the conditions where they normally live.
- Classify given adaptations as structural, behavioural or functional with a correct reason.
- Explain how a named adaptation improves survival or reproduction in a stated habitat.
- Define extremophile and give examples of extreme environments.
- Describe how deep sea vent bacteria survive high temperature and high pressure.
- Explain why extremophile enzymes and cell structures must remain functional in extreme conditions.
Adaptations exam tips
Marking Points
- Name the adaptation and classify it as structural, behavioural or functional where appropriate.
- State the advantage the adaptation provides in the named environment.
- Link the advantage to survival or reproduction, such as obtaining food, avoiding predators or attracting a mate.
- Use the information provided to select relevant adaptations rather than listing unrelated ones.
- Explain the mechanism, for example how a feature reduces heat loss or increases water uptake.
- Compare organisms in different environments to show how adaptations suit particular conditions.
- Define adaptation as an inherited feature that increases an organism's chance of survival and reproduction in its normal habitat.
- Classify a named example correctly as structural, behavioural or functional, for example thick fur as structural, migration as behavioural and reduced sweating as functional.
- Link each adaptation to a specific selection pressure in the habitat, such as low temperature, scarce water, strong sunlight or predation.
- Explain the consequence of the adaptation for survival or reproduction rather than merely naming the feature.
- Compare organisms in different habitats to show that the same feature can be advantageous in one environment and disadvantageous in another.
- Define extremophiles as organisms adapted to survive in extreme environments such as high temperature, high pressure or high salt concentration.
- Identify deep sea vent bacteria as extremophiles and state that they experience high temperature and high pressure.
- Explain that extremophile enzymes and cell structures remain functional under extreme conditions that would denature or damage those of most organisms.
- Describe how deep sea vent bacteria obtain energy without sunlight, for example by chemosynthesis using dissolved chemicals.
- Give at least one further example of an extreme environment, such as a salt lake or hot spring, and name an organism adapted to it.
Examiner Tips
- 💡Use the structure: feature, advantage, survival or reproduction benefit.
- 💡Refer explicitly to the environment named in the question to keep the explanation relevant.
- 💡If given information, quote or paraphrase the relevant detail to show you have used it.
- 💡Use the three labels structural, behavioural and functional explicitly when the question asks you to classify adaptations.
- 💡Structure longer answers as feature, challenge and benefit so every clause of the statement is addressed.
- 💡Choose examples from the habitat named in the question rather than repeating a standard polar bear or cactus answer.
- 💡Name the specific extreme condition before describing the adaptation, so the link is explicit.
- 💡Use the term extremophile accurately and apply it only to organisms living in extreme environments.
- 💡When asked about deep sea vents, mention both high temperature and high pressure, and refer to chemosynthesis rather than photosynthesis.
Common Mistakes
- Describing the adaptation without explaining its advantage; correct by adding how it helps the organism survive or reproduce.
- Confusing structural and behavioural adaptations; correct by checking whether the feature is a body part or an action.
- Giving a generic advantage that could apply anywhere; correct by linking the advantage to the specific named environment.
- Calling any feature an adaptation without linking it to survival or reproduction; correct this by always stating the benefit the feature gives in that habitat.
- Treating learned behaviour as a behavioural adaptation; correct this by checking that the behaviour is inherited and typical of the species.
- Confusing functional with structural adaptations; correct this by deciding whether the feature is a body part or an internal process such as water retention.
- Stating that extremophiles are a type of bacteria only; correct this by noting that extremophiles include members of several groups of organisms.
- Saying deep sea vent bacteria photosynthesise; correct this by explaining that they use chemosynthesis because sunlight does not reach the vents.
- Describing extreme conditions without linking them to an adaptation; correct this by pairing each condition with the feature that allows survival.