Biology STAAR Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What is defined as a biotic factor in an ecosystem?

Temperature

Air currents

Living organisms

A biotic factor in an ecosystem refers to any living component that affects or interacts with the organisms within that ecosystem. This includes plants, animals, fungi, and microorganisms. Living organisms play a crucial role in shaping their environment by competing for resources, preying on one another, forming symbiotic relationships, and contributing to nutrient cycling.

In contrast, the other choices relate to abiotic factors, which are non-living elements that influence ecosystem dynamics. Temperature, air currents, and water availability are all vital components of an ecosystem, but they fall under the category of abiotic factors, as they are not alive and do not possess biological characteristics. Understanding the distinction between biotic and abiotic factors is essential for studying ecosystem interactions and overall environmental health.

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Water availability

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