A form of adaptive colouration that helps animals to remain unnoticed is

1. Analyze the question The question asks for a form of adaptive colouration, which means a colour pattern that helps an animal survive, and specifically one that keeps it unnoticed, meaning camouflage.

2. Explain the concept Adaptive colouration includes:

• Camouflage (cryptic colouration): the animal blends into its background.
• Countershading: the upper body is dark and the underside is light. Sunlight from above makes the belly look darker, and the dark back and light belly cancel out this shading, so the animal looks flatter and less three-dimensional. Predators and prey therefore find it harder to spot. Examples are sharks, many fishes, and some antelopes.
• Warning colouration (aposematism): bright colours advertise danger, as in some poisonous frogs.
• Mimicry: one species resembles another.

3. Go through the options

• A. Hibernation: a state of dormancy in cold (winter) conditions. It is a behavioural and physiological adaptation, not a colouration.
• B. Aestivation: dormancy during hot, dry periods, such as in lungfish and snails. It is also not a colouration.
• C. Countershading: a colouration pattern that helps animals blend in and avoid detection. ✔
• D. Migration: seasonal movement from one place to another. It is behavioural, not a colouration.

4. Answer The correct option is C. countershading.

5. Exam tip If a question has the words "colouration" or "colour", look for the option about colour or pattern (camouflage, countershading, warning colours, mimicry). Hibernation, aestivation, and migration are all about behaviour in response to climate.