Multiple Choice
Which of the following best describes desertification, and how are nomadic lifestyles and droughts related to this process?
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48. Ecology
Introduction to Ecology
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Why do temperate grasslands have some of the most fertile soils on Earth?
A
Because the presence of dense forests prevents soil erosion.
B
Because the rapid decomposition of grasses adds large amounts of organic matter to the soil.
C
Because frequent rainfall leaches nutrients deep into the soil profile.
D
Because the soil is formed primarily from volcanic ash deposits.
Verified step by step guidance1
Understand the characteristics of temperate grasslands: These ecosystems are dominated by grasses rather than trees, and they experience moderate rainfall and distinct seasonal changes.
Recognize the role of grasses in soil fertility: Grasses in temperate grasslands grow quickly and die back seasonally, contributing to the accumulation of organic matter in the soil through decomposition.
Explain the process of decomposition: When grasses die, microorganisms break down the plant material, releasing nutrients like nitrogen and phosphorus into the soil, enriching its fertility.
Contrast with other options: Dense forests prevent soil erosion but do not contribute to rapid organic matter accumulation. Frequent rainfall can leach nutrients away rather than enriching the soil. Volcanic ash deposits are not a primary factor in temperate grasslands.
Conclude why temperate grasslands have fertile soils: The rapid decomposition of grasses adds large amounts of organic matter to the soil, making it highly fertile and suitable for agriculture.
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