Practice question

Euryphagous organisms consume a broad range of food types; eu-ry indicates breadth, while -phagy refers to feeding. Such generalists can switch resources when one becomes scarce, which may support survival in variable environments. A stenophagous species has a narrow diet and may depend on one prey or host type. “Omnivore” describes consumption from both plant and animal trophic sources, not necessarily broad choice within those sources: an omnivore can still specialize on a few foods. “Polyphagous” is also widely used for organisms, especially herbivorous insects, that feed on many host species, so it overlaps strongly with euryphagous. However, when the contrast is framed as tolerance breadth, euryphagic is the direct counterpart of stenophagic and therefore fits the terminology used in ecological niche breadth. Dietary breadth can reflect digestive enzymes, mouthparts, detoxification capacity, behaviour, and learning. Generalism brings flexibility but may involve performance trade-offs because a specialist can be more efficient on its preferred resource. The concept concerns the fundamental feeding niche; actual diet may be narrower at a particular place or season if only a subset of acceptable foods is available.