Biology: Science for Life with Physiology (5th Edition)
5th Edition
ISBN: 9780321922212
Author: Colleen Belk, Virginia Borden Maier
Publisher: PEARSON
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Chapter 24, Problem 9LTB
Summary Introduction
Introduction:
Soil is created by the breakdown of rocks and the accumulation of organic matter from dead, decaying plants and animal remains. A healthy soil is made up of a bottom layer of eroded rocks, the top layer of organic materials and a middle layer in which the components of top and base layers are mixed by earthworms and other soil organisms.
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The most important flux (largest) in a non-carbon nutrient cycle is
Biological fixation
None of these
Decomposition
Weathering
Non-biological fixation
Human Activity
Effects on Soil Quality
Effects on Soil Quantity
The practice of crop rotation uses nitrogen fixation to create fertile fields. First, a
plant without a nitrogen-fixing relationship, such as corn, is planted. After the
harvest, a nitrogen-fixing plant replaces the initial crop. Instead of harvesting the
nitrogen-fixing plant, however, it is plowed under. The cycle continues in this
manner. Why would nitrogen-fixing plants be plowed under instead of
harvested? *
To increase water retention.
Nitrogen-fixing plants are not a food crop.
To increases usable nitrogen in the soil.
To decrease bacteria in the soil.
Chapter 24 Solutions
Biology: Science for Life with Physiology (5th Edition)
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- Plants absorb dissolved nitrates from soil and convert them into : Free nitrogen Urea Proteins Ammoniaarrow_forwardCompared to traditional tillage, conservation tillage reduces topsoil erosion accelerates water loss from the soil causes soil compaction does not require herbicides reduces the amount of carbon stored in the groundarrow_forwardWhat is the importance of decomposition to nutrient cycling?arrow_forward
- A shortage of phosphorus in the soil would make it difficult for a plant to makearrow_forwardWhich of the following best describes how using fertilizer would affect the nitrogen cycle? The use of fertilizer would result in more nitrogen in the groundwater. The use of fertilizer would result in less nitrogen in the soil. The use of fertilizer would result in more phosphorus in the soil. The use of fertilizer would result in more nitrogen being added to the carbon cycle.arrow_forwardDuring biological nitrogen fixation, microbial plant symbionts uptake_________and converted it to__________?arrow_forward
- Why is the phosphorus cycle different from the nitrogen cyclearrow_forwardThe practice of crop rotation uses nitrogen fixation to create fertile fields. First, a plant without a nitrogen-fixing relatiorhip, such as corn, is planted. After the harvest, a nitrogen-fixing plant replaces the initial crop. Instead of harvesting the nitrogen-fixing plant, however, it is plowed under. The cycle continues in this manner. Why would nitrogen-fixing plants be plowed under instead of harvested? * To increase water retention. O Nitrogen-fixing plants are not a food crop. To increases usable nitrogen in the soil. To decrease bacteria in the soil.arrow_forwardWhy is nitrogen used in fertilizer when there's so much N2 in the airarrow_forward
- The practice of crop rotation uses nitrogen fixation to create fertile fields. First, a plant without a nitrogen-fixing relationship. such as corn, is planted. After the harvest, a nitrogen-fixing plant replaces the initial crop. Instead of harvesting the nitrogen-fixing plant, however, it is plowed under. The cycle continues in this manner. Crop rotation would allow the farmer to reduce which of the following? O Planting seeds. O Watering the fields. O The use of manufactured fertilizer. O The burning of fossil fuels by farm equipment. In the year 2000. specimens of Caulerpa taxifolia,a green alga used in tropical aquariums, were found off the coast of California. Native to the indian Ocean, C. taxifolia is known for aggressive growth and an ability to compete with sea grasses.Jt is currently on an intemational list of invasive species. Which of thearrow_forwardWhen a salmon carcass rots in a riparian forest and the nitrogen is released into the environment, it contributes to this flux in the nitrogen cycle: mineralization denitrification nitrogen immobilization Onitrogen fixation nitrificationarrow_forwardAn extremely acid soil generally limits the availability of many nutrients in the soil. True or Falsearrow_forward
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