Multiple Choice
Which type of forest is likely to have the most nutrient-rich soil?
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35. Soil
Soil and Nutrients
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Why is humus a beneficial component of soil?
A
It prevents all microorganisms from living in the soil.
B
It improves soil structure and increases nutrient retention.
C
It directly provides plants with nitrogen gas from the atmosphere.
D
It makes the soil more acidic, which is ideal for all plant growth.
Verified step by step guidance1
Understand the definition of humus: Humus is the organic component of soil formed by the decomposition of plant and animal matter. It is rich in nutrients and plays a critical role in soil health.
Evaluate the first option: 'It prevents all microorganisms from living in the soil.' This is incorrect because humus actually supports microbial activity, which is essential for nutrient cycling and soil health.
Analyze the second option: 'It improves soil structure and increases nutrient retention.' This is correct because humus enhances soil texture, water retention, and nutrient-holding capacity, making it beneficial for plant growth.
Examine the third option: 'It directly provides plants with nitrogen gas from the atmosphere.' This is incorrect because humus does not directly provide nitrogen gas; nitrogen fixation is carried out by specific microorganisms in the soil.
Review the fourth option: 'It makes the soil more acidic, which is ideal for all plant growth.' This is incorrect because humus does not universally make soil more acidic, and not all plants thrive in acidic conditions. Its primary benefit is improving soil structure and nutrient retention.
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