The practice of crop rotation uses nitrogen fixation to create fertile fields. First,. 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 th 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? * O 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.

The practice of crop rotation uses nitrogen fixation to create fertile fields. First,. 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 th 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? * O 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.

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter42: Ecosystems

Section: Chapter Questions

Problem 3CT

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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. Which of the following is not an abiotic factor that affects plants being used in crop rotation? a) NH3 availability b) Soil temperature c) Herbivore density d) Oxygen concentration
How do fertilizers boost crop growth? How can largeamounts of fertilizer added to soil also end up in watersupplies and the atmosphere? How do sustainable agricultureapproaches reduce fertilizer runoff?
Distinguish between a source and a sink. How can the same plantpart act as both a source and a sink?
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? a) Planting seeds. b) Watering the fields. c) The use of manufactured fertilizer. d) The burning of fossil fuels by farm equipment.
During biological nitrogen fixation, microbial plant symbionts uptake_________and converted it to__________?
. What is the difference between evaporation and transpiration? Give examples of how the water cycle interacts with the carbon, phosphorus, and nitrogen cycles.
denitrification occure in wetland soil because - 1 - The top thin layer of soil is oxidized and the soil layer below is reduced. 2 - The top thin layer of soil is reduced and the soil layer below is oxidized 3 - The top thin layer of soil is oxidized and the soil layer below is also oxidized. 4 - The top thin layer of soil in reduced and the soil layer below is also reduced
How are soils formed? Through the breakdown of what material? Why are new soils not suitable for most plant species?
Mass flow occurs when; a. Soil temperatures change, thereby changing molecular motion. b. Atmospheric pressures change c. Plant roots extract water and air flows into empty pores d. The soil is being flooded e. all of the above
Many plants that produce nodules for nitrogen-fixing bacteria are common on disturbed sites. Explain how these plants might simultaneously compete with and facilitate other plant species.
Plants obtain ______ by taking it up from the air. a. nitrogen c. phosphorus b. carbon d. water
How does the slope of a line on a graph indicate rate (such as rate of transpiration)