The ability of chameleon to change its colour rapidly is an adaptation for

Step 1: Analyze the question We are asked what the chameleon's rapid colour change is mainly an adaptation for. This is about the survival value of colour change.

Step 2: Explain the concept Many animals use camouflage (cryptic colouration) to blend into their surroundings. This helps them avoid being seen by predators, and it can also help them ambush prey. In the classical school Biology treatment, the chameleon's colour change in response to its background is the standard example of protective colouration/camouflage, which means escaping detection by enemies.

Step 3: Evaluate the options

• A. Obtaining food: Camouflage can help a chameleon sneak up on insects, but the chameleon mainly catches food with its long, sticky, projectile tongue. This is not the main purpose of colour change.
• B. Attracting mate: Colour changes in chameleons do play a role in courtship displays. However, this is not the primary adaptation that textbooks associate with the rapid change.
• C. Communication: Chameleons do signal mood and aggression through colour. Modern research suggests this is a major function, but it is not the answer expected at the JAMB level.
• D. Escaping detection: This is the classic textbook answer, as colour change allows the animal to match its background and avoid predators.

Step 4: Answer The correct option is D. escaping detection.

Exam tip: In JAMB Biology, when you see "chameleon" and "change colour", think camouflage = protection from predators = escaping detection. Similar examples are the stick insect, the leaf insect, and the grasshopper that matches green grass.