An ADAPTATION is any feature of an organism that makes it better suited to its environment — increasing its chances of survival and reproduction.
Adaptations arise through NATURAL SELECTION — individuals with features better suited to their environment survive longer and reproduce more, passing those features to offspring. Over many generations, the adaptation becomes more common in the population.
There are three types of adaptation:
1. STRUCTURAL — physical features of the organism's body.
2. BEHAVIOURAL — things the organism does.
3. FUNCTIONAL (physiological) — internal chemical or biological processes.
Adaptations to Extreme Environments
ARCTIC AND COLD ENVIRONMENTS:
Thick fur or blubber (fat layer) — STRUCTURAL — insulates against heat loss.
White colouration (e.g. polar bears, Arctic foxes in winter) — STRUCTURAL — camouflage against snow.
Small ears and limbs relative to body size — STRUCTURAL — reduces surface area to volume ratio, minimising heat loss.
Hibernation — BEHAVIOURAL — reduces energy need during winter when food is scarce.
Antifreeze proteins in blood of Arctic fish — FUNCTIONAL — prevents blood freezing.
DESERT ENVIRONMENTS:
Large ears (e.g. fennec fox, jackrabbit) — STRUCTURAL — increase surface area for heat loss.
Pale colouration — STRUCTURAL — reflects sunlight, reduces heat absorption.
Nocturnal behaviour — BEHAVIOURAL — avoids the intense daytime heat, active at night when cooler.
Cactus: thick, waxy stem stores water; reduced leaves (spines) reduce water loss — STRUCTURAL.
Camel: humps store fat (not water) as energy reserve; can tolerate significant dehydration — FUNCTIONAL.
Kangaroo rat: produces very concentrated urine to conserve water — FUNCTIONAL.
DEEP SEA:
Bioluminescence — FUNCTIONAL — producing light to attract prey or communicate in total darkness.
High pressure tolerance — FUNCTIONAL — specialised cell membranes and proteins.
Large eyes — STRUCTURAL — maximise light detection in dim conditions.
Predator and Prey Adaptations
The ongoing evolutionary 'arms race' between predators and prey drives many of the most striking adaptations.
PREDATOR ADAPTATIONS:
Forward-facing eyes — STRUCTURAL — binocular vision allows accurate depth perception for judging distance when striking.
Sharp claws and teeth — STRUCTURAL — for catching and killing prey.
Camouflage — STRUCTURAL — stalking prey without being seen.
Speed and agility — STRUCTURAL/FUNCTIONAL — for chasing prey.
Pack hunting behaviour — BEHAVIOURAL — cooperating to take down larger prey.
PREY ADAPTATIONS:
Side-facing eyes — STRUCTURAL — wide field of vision to detect approaching predators.
Adaptations are NOT something an organism CHOOSES or deliberately develops. Organisms cannot decide to grow a thicker coat because it is cold — adaptations arise through natural selection over many generations. A single organism cannot adapt during its lifetime through genetic change.
📌 Key Note
Adaptations: structural (physical features), behavioural (what organism does), functional (internal processes). Arise through natural selection. Cold adaptations: small surface area, insulation. Desert adaptations: water conservation, large surface area for cooling.
🎯 Matching Activity — Structural, Behavioural or Functional?
Match each adaptation to its correct type. — drag the symbols on the right to match the component names on the left.
Structural
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Behavioural
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Functional
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Structural
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Behavioural
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Functional
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Forward-facing eyes in owls — binocular vision for judging distance when hunting
Kangaroo rat producing very concentrated urine — conserves water in desert
Antifreeze proteins in the blood of Arctic fish — prevents blood from freezing
Hibernation in bears — reduces energy need during cold winter months
Wildebeest migrating in large herds — safety in numbers from predators
Thick blubber layer in seals — insulates against cold ocean water
🎯 Test Yourself
Question 1 of 2
1. A polar bear has thick white fur and a layer of blubber. What type of adaptations are these?
2. Why do desert animals like the fennec fox have very large ears?
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