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Plant 160 Final Exam Review

Review of course content
Course

Weed Science (PLTH 105)

10 Documents
Students shared 10 documents in this course
Academic year: 2018/2019
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California State University Fresno

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Plant 160 Final Exam Review

Mid 1 questions: 2020

  1. Shepherd’s purse is classified as a: a. Long day plant
  2. Based on photosynthetic mechanism, Russian thistle is an example of a a. C4 weed
  3. The weed species invading Australian homes as shown in the video in class was: a. Tumbleweed
  4. Which of these are parasitic weeds: a. Dodder and Striga
  5. Which of these families consist of the greatest number of the world’s worst weeds: a. Poacea
  6. Which of these species have stolons? a. Bermudagrass
  7. Which of these species have rhizomes? a. Johnsongrass
  8. Movement of seeds from one place to another is called: a. Dispersal
  9. Wind dispersal is a major method of seed dispersal in which of these weed species? a. Horseweed
  10. A major invasive weed in California covering almost 22 million acres is a. Yellow starthistle
  11. Which of these species is a native plant of California? a. Tarweed
  12. Which of these can be used as a smother crop? a. Sorghum
  13. A type of plant species or a crop that produces chemicals that are harmful to other plants is called: a. Allelopathic crop
  14. The first commercially synthesized herbicide was a. 2,4-D
  15. The use of cover crops is an example of: a. Cultural control
  16. Dandelion is a: a. Perennial
  17. Two proponents of the theory of plant competition are a. Tilman and Grime
  18. Hydrilla is an example of: a. Aquatic weed
  19. Japanese dodder is classified as a noxious weed with a rating of: a. A
  20. The period during which the crop must be maintained weed-free to avoid irreversible damage through competition is called: a. Critical period for weed control
  21. Failure of seed to germinate under environmental conditions optimal for germination is known as: a. Dormancy
  22. Soil solarization is an example of: a. Physical control
  23. Which of these is a practice banned in California? a. Hand weeding with short-handled hoes
  24. Which of these practices would select for the prevalence of prostrate growing weeds: a. Mowing
  25. Which of these practices would lead to the majority of weed seeds being confined to the top 2 inches of the soils? a. No-till

Mid 1 questions: 2019

  1. The study of the interaction or relationship between a weed and its environment is known as: a. Weed ecology
  2. A group of individuals of the same species is known as: a. Community
  3. Shepherds purse is a: a. Winter annual
  4. The A, B, C, Q weed ratings are associated with: a. Noxious weeds
  5. Duckweed is an example of: a. Aquatic weed
  6. The thickened underground stem tissue that is a characteristic of johnsongrass is known as: a. Rhizome
  7. Stems that grow along the surface are called: a. Stolons
  8. Based on its photosynthetic mechanism, little mallow (cheeseweed) is an example of a: a. C3 weed
  9. Which of these herbicides would require a complete coverage of the plant to have good efficacy? a. Contact herbicide
  10. Growing oats with alfalfa for weed control until the crop establishes would be an example of: a. Nurse crop
  11. An herbicide applied to the soil at the time of last cultivation is called: a. Layby
  12. A practice of using plastic to heat the soil to kill weed seeds is called: a. Solarization
  13. Which of these crops are known to have potential allelopathic effects: a. Walnut
  14. The type of biological control in which an organism is imported from the area of origin is called: a. Classical
  15. Japanese dodder has which of these legal classifications? a. A
  16. In which of the following situations would mowing be the most effective weed control method? a. Controlling erect broadleaf annual weed
  17. Which of these herbicide application methods would need soil incorporation? a. PPI
  18. Which of these may be an invasive weed that looks more like bamboo? a. Giant reed
  19. Horseweed is an example of a: a. R species
  20. Use of cover crop is an example of: a. Cultural weed control
  21. Sub-surface drip irrigation is an example of: a. Cultural weed control
  22. The first commercially synthesized herbicide: a. 2,4-D
  23. Herbicides that are applied prior to the emergence of the crop, but after planting is referred to as: a. Pre-emergence
  24. The names Grimes and Tilman are associated with: a. Theories of competition
  25. When two or more plants of different species compete, the competition is called: a. Intercompetition
  26. Weeds compete with crops primarily for: a. 1) light, 2) water, and 3) nutrients
  27. The top ranked invasive weed in California is: a. Yellow starthistle

a. Conservation and enhancement 30. Herbicide tolerant crops were introduced in the a. 1990s 31. Which of these depths is ideal for incorporation of pre-emergence herbicides? a. 1 to 2 inches 32. Which of these herbicides is a concern due to leaching in sandy soils? a. Simazine 33. This herbicide was used fairly heavily on carrots in California but now is regulated? a. Linuron 34. Which of these herbicides can move both in the xylem and the phloem? a. 2,4-D 35. In which of these phases does conjugation reactions occur during plant metabolism when herbicides are being deactivated? a. Phase II 36. The phenomenon of herbicides molecules binding to the surface of the soil particle is called: a. Adsorption 37. This herbicide is not labeled for use in agricultural systems? a. Milestone 38. This herbicide causes epinasty (twisting of stems)? a. Dicamba 39. An herbicide label recommends the use of 1 to 4 oz/ac. Which of these situations would require the use for the higher end of the recommended rate? a. High organic matter soils 40. ACCase inhibitors are; a. Grass herbicides 41.

R strategist weeds are: unstable, fast-growing, quick reproduction, smaller seeds Ex: cheeseweed, clovers K strategist weeds are: stable, slow-growing, slow reproduction, larger seeds Ex: Johnsongrass, poison oak

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Plant 160 Final Exam Review

Course: Weed Science (PLTH 105)

10 Documents
Students shared 10 documents in this course

University: California State University Fresno

Was this document helpful?
Plant 160 Final Exam Review
Mid 1 questions: 2020
1. Shepherd’s purse is classified as a:
a. Long day plant
2. Based on photosynthetic mechanism, Russian thistle is an example of a
a. C4 weed
3. The weed species invading Australian homes as shown in the video in class was:
a. Tumbleweed
4. Which of these are parasitic weeds:
a. Dodder and Striga
5. Which of these families consist of the greatest number of the world’s worst weeds:
a. Poacea
6. Which of these species have stolons?
a. Bermudagrass
7. Which of these species have rhizomes?
a. Johnsongrass
8. Movement of seeds from one place to another is called:
a. Dispersal
9. Wind dispersal is a major method of seed dispersal in which of these weed species?
a. Horseweed
10. A major invasive weed in California covering almost 22 million acres is
a. Yellow starthistle
11. Which of these species is a native plant of California?
a. Tarweed
12. Which of these can be used as a smother crop?
a. Sorghum
13. A type of plant species or a crop that produces chemicals that are harmful to other plants is called:
a. Allelopathic crop
14. The first commercially synthesized herbicide was
a. 2,4-D
15. The use of cover crops is an example of:
a. Cultural control
16. Dandelion is a:
a. Perennial
17. Two proponents of the theory of plant competition are
a. Tilman and Grime
18. Hydrilla is an example of:
a. Aquatic weed
19. Japanese dodder is classified as a noxious weed with a rating of:
a. A
20. The period during which the crop must be maintained weed-free to avoid irreversible damage through
competition is called:
a. Critical period for weed control
21. Failure of seed to germinate under environmental conditions optimal for germination is known as:
a. Dormancy
22. Soil solarization is an example of:
a. Physical control
23. Which of these is a practice banned in California?
a. Hand weeding with short-handled hoes
24. Which of these practices would select for the prevalence of prostrate growing weeds:
a. Mowing
25. Which of these practices would lead to the majority of weed seeds being confined to the top 2 inches of the
soils?
a. No-till

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