Agronomy Degree Practice Exam

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Elevate your agronomy skills with our exam. Prepare using quizzes, flashcards, and multiple choice questions. Familiarize yourself with key concepts and excel in your exam!

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What is the layer of soil that makes up a soil profile called?

Horizon
Plate
Film
Sheet

The correct answer is: Horizon

The layer of soil that makes up a soil profile is referred to as a horizon. In soil science, a soil profile consists of different layers that vary in color, texture, composition, and other properties. These layers, or horizons, are categorized mainly into the topsoil, subsoil, and parent material, each playing a crucial role in soil health and function. The top layer, known as the O horizon, typically consists of organic matter and is rich in nutrients. Below this, the A horizon contains mineral soil and more organic material. The various horizons together help determine the soil's ability to support plant growth, hold moisture, and maintain ecological balance. Other terms, such as plate, film, or sheet, do not accurately describe the stratification and specific characteristics of soil layers found in a soil profile, making “horizon” the correct terminology in this context.