Biology STAAR (State of Texas Assessments of Academic Readiness) Practice Test

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Study for the Biology STAAR Test. Improve your skills with flashcards and multiple choice questions, each question is accompanied by hints and explanations. Prepare for success!

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What is parasitism?

A relationship where both species benefit
A relationship where one benefits and the other is harmed
A relationship where one is unaffected
A relationship based on mutual dependence

The correct answer is: A relationship where one benefits and the other is harmed

Parasitism is defined as a specific type of symbiotic relationship where one organism, known as the parasite, benefits at the expense of another organism, called the host. In this interaction, the parasite derives nutrients or some advantage from the host, which may suffer harm as a result of this relationship. This harm can range from mild effects, such as reduced fitness or growth in the host, to severe outcomes, including illness or death. Understanding parasitism is crucial in ecology and biology as it illustrates the complex interactions that can occur within ecosystems, highlighting the balance of dependence and the struggles organisms face for survival. The options that describe mutual benefit or lack of effect do not accurately capture the essence of parasitism, which is inherently characterized by this imbalance.