Ecology Science Olympiad Practice Test – Prep, Study Guide & Practice Exam

A heterotroph is defined as an organism that obtains its food and energy by consuming other living organisms, which includes plants, animals, and other organic material. Heterotrophs cannot produce their own food and rely on other sources of energy, primarily from plants (which are autotrophs) or from other animals.

This characteristic is essential in ecological systems, as heterotrophs play a crucial role in the food web, serving as consumers that transfer energy from primary producers (like plants) up the chain to higher trophic levels. The energy they derive from their food supports their growth, reproduction, and maintenance of physiological functions.

In contrast, organisms that make their own food using sunlight or inorganic substances are classified as autotrophs, such as plants through photosynthesis or certain bacteria through chemosynthesis. Decomposers also play important ecological roles, but they typically break down dead organic material rather than actively seeking and consuming living organisms. Thus, C accurately describes the role and function of heterotrophs within ecosystems.