The function of the red head in male Agama lizards is to

Analyze the question: It asks about the biological function of the bright red head seen in male Agama lizards (Agama agama). This is a question on animal behaviour and adaptation, specifically colouration.

Concept: In Agama lizards, the male's bright orange-red head and blue-purple body are display colours (sexual dimorphism). Females and juveniles are dull brown. The colouring is most vivid in dominant males during the breeding season. It serves two linked purposes:

• Courtship: it attracts females and signals a healthy, dominant male.
• Territorial display: it can also signal rivals, and males bob their heads to threaten other males.

Going through the options:

• A. Conceal and camouflage: Wrong. A bright red head makes the lizard conspicuous, not hidden.
• B. Scare other males from the territory: Partly true in nature, since males do defend territory and use head-bobbing and colour in contests. But the colour is mainly taught in textbooks as a sexual signal, and this is not the standard answer.
• C. Attract female lizards for mating purposes: This matches the standard textbook treatment of sexual dimorphism in Agama. Only the male has the bright head, and it is shown off during the breeding season.
• D. Warn predators of distastefulness: Wrong. This is warning (aposematic) colouration, and Agama lizards are not distasteful.

Exam tip: Remember "Agama male = colourful for courtship; female = dull." When a question asks about the bright colour of only one sex, think of sexual attraction first. Camouflage means blending in, and warning colouration needs a harmful or bad-tasting animal.