Adaptive Features IGCSE Biology 0610

Adaptive Features: How Organisms Are Suited to Their Environment

Biology editorial review is supported by the named review panel. Reviewer participation may vary by guide. Checked against Cambridge IGCSE Biology 0610 (2026–2028); last reviewed August 2026.

Key concept

An adaptive feature is an inherited characteristic that increases an organism's chance of surviving and reproducing in its environment. Adaptations can be structural (body shape), behavioural (actions) or physiological (body processes).

Adaptation questions require students to link a specific feature to a specific advantage in a named environment. Simply listing features without explaining how each one helps the organism survive is a common reason for lost marks.

Types of adaptation

Structural adaptations involve physical body features. For example, a polar bear has thick fur and a layer of blubber for insulation, white fur for camouflage in snow, and large paws to spread its weight on ice.

Behavioural adaptations involve actions. For example, penguins huddle together to reduce heat loss, and some birds migrate to warmer regions in winter to find food.

Physiological adaptations involve body processes. For example, desert animals produce very concentrated urine to conserve water, and some organisms produce antifreeze proteins to survive sub-zero temperatures.

Xerophyte adaptations (dry conditions)

Xerophytes are plants adapted to survive in dry environments. Their adaptations reduce water loss by transpiration. Examples include:

Thick waxy cuticle on leaves to reduce evaporation from the leaf surface. Reduced number of stomata or stomata sunken in pits, which trap a layer of moist air and reduce the diffusion gradient for water vapour. Rolled leaves trap humid air inside, reducing transpiration. Small or no leaves (spines in cacti) reduce the surface area for water loss. Deep or widespread root systems to access water over a large area or at depth.

Hydrophyte adaptations (aquatic conditions)

Hydrophytes are plants adapted to live in water or very wet conditions. Their key adaptations are different from xerophytes because their challenge is obtaining gases, not conserving water.

Air spaces in stems and leaves (aerenchyma) help the plant float and allow gas to diffuse to submerged parts. Stomata on the upper surface of floating leaves for gas exchange with the air. Flexible stems to bend with water currents without breaking. Thin or absent cuticle because water conservation is not needed.

Predator and prey adaptations

Predators have adaptations for catching prey: forward-facing eyes for binocular vision and accurate distance judgement, sharp claws and teeth for catching and killing, and speed or stealth for pursuing or ambushing prey.

Prey organisms have adaptations to avoid being caught: camouflage to blend with surroundings, warning colours to advertise toxicity, eyes on the sides of the head for a wide field of vision to detect predators, and speed or agility for escaping. Each adaptation must be linked to its specific survival advantage.

Try a focused question (4 marks)

A cactus has spines instead of leaves and a thick waxy cuticle. Explain how these features help it survive in a desert.

Show the answer and marking guidance

Spines have a very small surface area, which reduces water loss by transpiration.
Spines also deter herbivores from eating the plant.
The thick waxy cuticle covers the stem surface and reduces evaporation of water.
Both adaptations help the plant conserve water in the dry desert environment.

Original Cambridge-style practice written for this site. It is not an official Cambridge past-paper question.

Common mix-ups to avoid

Check these points against your own answer before moving on.

Listing adaptations without explaining the advantage each provides.
Saying organisms "develop" adaptations in their lifetime rather than inheriting them.
Confusing xerophyte and hydrophyte adaptations.
Describing predator features for prey organisms or vice versa.