ENVS 150 Final

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drb8788
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186787
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ENVS 150 Final
Updated:
2012-12-03 04:27:24
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ENVS
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ENVS 150 Chap. 14, 15, & 2
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  1. Major purposes of land preparation include all except:
    Loosen soil to allow displacement where needed
  2. The “ideal” soil is often considered to consist of ___%  solid and ___% open or pore space. Of the pore space, ___% is small enough to hold water.
     50, 50 50
  3. A _________ reduces soil clod sizes, after disking, smooths the soil surface, does small-scale leveling.
    Harrow
  4. Methods of soil conservation include:
    Using grassed waterway, Strip cropping, Minimum tillage, Plowing on the contour
  5. Soil degradation includes:
    Salination, Compaction, Accerelated Erosion, & Loss of Organic Matter
  6. The loss of organic matter with regular tillage may eventually lead to deterioration of soil structure and loss of water-holding capacity. 
    True
  7. ____________________ is an instrument that measures the soil moisture tension.
    Tensiometer
  8. _____________ irrigation is a greenhouse irrigation system consisting of small tubes (like an IV tube) that supply water directly to each pot.
    Trickle or drip
  9. _____________ irrigation is an outdoor surface irrigation system used for row crops.
    Furrow
  10. ____________ is the use of agronomic or horticultural practices that favor plant development and minimize pest or pathogen activity.
    Cultural Practices
  11. Which of the following weed control methods are considered 'organic'?
    Mechanical cultivation, Burning, Hay mulch
  12. ___________ is defined as suboptimal plant growth brought about by a continuous irritant such as a ________ or via chronic exposure to less that ideal growing conditions. In contrast injury is the loss of plant vigor from an instantanous event, i. e. a lightning strike.
    Disease/Pathogen
  13. Fungi cause __________ plant diseases than all of the other organisms combined. Fungi cna be beneficial by participating in the _________ _________ decaying organic matter, converting it to plant nutrients.
    More/Biological cycles
  14. _________ involves the use of crop row spacing, crop rotation, flooding, mechanical cultivation, fire and mulches to enhance the crops ability to compete with weeds.
    Cultural Weed Control
  15. Plant __________ require a wound in order to enter the plant cells. Once inside they can move freely from cell to cell via the __________.
    Virus/Plasodesmata
  16. In an ecosystem with a complete vegetation cover (canopy), competition among plants will most likely be for:
    Light
  17. Recycling in ecosystems is mainly carried out by
    Saprophytes and detritivores     
  18. Alexander von Humboldt was the first to notice that:
    Similar vegetation grew in areas with similar climate around the globe.
  19. Convergent global air currents at 60 degrees latitude and divergent global air currents at 30 degrees latitude:
    Bring rainfall and dry conditions, respectively
  20. A collection of ecosystems with similar climate, soil, and plant composition are called:
    Biomes
  21. An easy cropping practice that reduces topsoil losses is to____________—instead of up and down the hill.
    Plowing on the contour
  22. ___________removes excess soil water, increasing air & oxygen concentration in the soil.
    Drainage
  23. Repeated additions of ___________provide constant food and raw materials to soil organisms.
    Organic matter
  24. _________ are the most serious vertebrate pests, however deer, mice, gophers, squirrels, rabbits, nutriarats, beaver, racoons, and various birds may also become pests.
    Rats
  25. Those growing plants must have a firm understanding of weed science, __________/__________ and have to learn how to manage plant pests or otherwise minimize plant losses caused by importatnt plant pests.
    Entemology/plant pathology  
  26. Annual weeds are generally propagated by _________, while perennial weeds are regenerated in the same way and by ___________.
    Seed/vegitative propagules           
  27. __________ is the use of pesticides to supress or inhibit pest/pathogen activities.
    Chemical Applications
  28. __________ of the crop plant to the pest may be the only cost effective pest control when growing large-acreage field crops like corn, soybeans, grains, and cotton.
    Genetic Host Resistance
  29. _________ is the use of beneficial or antagonistic organisms that kill or supress plant pests or pathogens.
    Biological control
  30. The lands between _______ and ________ consists of ________.
    Deserts/Forests/Grasslands
  31. Which of the following is correctly ordered from smallest scale to largest scale?
    Individual species – communities – habitats – ecosystems – biomes
  32. ______ is the main influence on vegetation type.
    Climate
  33. The Hadley Cell is a circulation of rising air and precipitation over the ______.
    Equator
  34. Which of the following are known to support mutually beneficial associations?
    Both Lichens and Rhizobium
  35. _____ occurs when more than one organism draws on a resource that is in short supply.
    Competition
  36. The ___________ reduces labor by moving pipe across the field with a small gasoline engine.
    Wheel-line irrigation system
  37. The pH of acid soil can be increased by adding ___________.
    Calcium Carbonate
  38. To maintain or improve soil fertility, nutrients must be added in amounts __________those removed by crop harvest.
    Equal to or greater than
  39. ____________ is defined as mechanical manipulation of soil to provide a favorable environment for crop growth.
    Tillage
  40. Instead of plowing, disking & otherwise cultivating to remove old vegetation, ___________are used to kill the vegetation which is left in place.
    Herbicides
  41. Most insects have __________ economic impact on humans. Actually only _____% ever reach pest status.
    No/5%
  42. A ___________ refers to a subpopulation of plants within a species differing only slightly from the general population.
    Biotype
  43. Cultural priactices in pest management favor plant development, and minimize pest or pathogen activity. These practices include tillage practices, water management, __________, ___________, and sanitation.
    Fertility/crop rotation
  44. ________ turns arid lands to desert.
    Overgrazing
  45.   Crop production systems that are distinctly different from the locale’s preexisting biome are more difficult to sustain.
    True
  46. A mutually beneficial relationship between two organisms is called a ______.
    Symbiotic association
  47. ______ exists when a resource is partitioned so that different portions are accessible to certain species.
    Niche
  48. After rainforest is cleared for agriculture, you may grow crops short term, because nutrients are rapidly ________.
    Exhausted
  49. Wetlands are __________ __________ _________ providing refuge for animals, and supplying moisture to plants and animals during dry times.
    Ecological buffer zones

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