Ecology Regents Practice Exam 2026 – Comprehensive Study Guide

Heterotrophs are organisms that cannot synthesize their own food and therefore rely on other organisms for their nutritional needs. This characteristic is fundamental to their role in ecosystems, as they consume various forms of organic matter—such as plants, animals, and decomposed materials—to obtain the energy and nutrients necessary for survival.

This dependency on other organisms distinguishes heterotrophs from autotrophs, which can produce their own energy through processes like photosynthesis or chemosynthesis. Additionally, while some heterotrophs may play a role in recycling nutrients, this is not a defining characteristic—they do contribute to nutrient cycling as they decompose organic material, but the essence of being a heterotroph lies in their need to consume other organisms for nutrition. Thus, the statement correctly identifies the core characteristic of heterotrophs.