객관식
Which of the following best describes the ability of soil to provide adequate nutrients to plants?
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35. Soil
Soil and Nutrients
객관식
Which soil horizon is typically richest in organic material and is most affected by climate variations?
A
R horizon
B
B horizon
C
O horizon
D
C horizon
검증된 단계별 안내1
Understand the concept of soil horizons: Soil horizons are layers of soil that differ in composition, texture, and color. They are labeled as O, A, B, C, and R horizons, each with distinct characteristics.
Learn about the O horizon: The O horizon is the topmost layer of soil, primarily composed of organic material such as decomposed leaves, plants, and microorganisms. It is rich in nutrients and plays a vital role in supporting plant growth.
Recognize the role of climate: Climate variations, such as temperature and precipitation, significantly affect the O horizon. For example, warmer and wetter climates promote faster decomposition of organic matter, while colder or drier climates slow down this process.
Compare the O horizon to other horizons: The R horizon is bedrock, the C horizon consists of weathered parent material, the B horizon accumulates minerals like clay, and the A horizon is a mix of organic material and minerals. None of these are as rich in organic material as the O horizon.
Conclude that the O horizon is the correct answer: Based on its composition and sensitivity to climate variations, the O horizon is the soil layer richest in organic material and most affected by environmental factors.
