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Crops > Chapter 15 > Flashcards

Chapter 15 Flashcards

1
Q

It is natural for weeds to fill empty niches in cropping systems

A

True

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2
Q

Weeds can be classified by the environments in which they grow

A

True

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3
Q

Crop plants are never weeds

A

False

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4
Q

Biennial weeds flower in the first year

A

False

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5
Q

Most dicots are easier to kill by cultivation than monocots

A

True

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6
Q

A weed must be alive in order to demonstrate allopathic properties

A

False

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7
Q

Over 95% of the corn, soybean and cotton crops grown are treated with herbicides

A

True

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8
Q

Weeds can interfere with harvesting equipment

A

True

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9
Q

Weed seed tends to be bigger than crop seed

A

False

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10
Q

Animals do not have a significant role in weed dispersal

A

False

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11
Q

Insecticides are used more than any other pesticide

A

False

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12
Q

It is a violation of federal law to use an herbicide in a manner inconsistent with its labeling

A

True

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13
Q

Selective herbicides affect almost all plants

A

False

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14
Q

Different crops species select for different weed species

A

True

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15
Q

A disadvantage of biological control is the possibility of affecting non-target species

A

True

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16
Q

Tillage is an effective strategy of weed control regardless of weed species

A

False

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17
Q

The main concern with atrazine is leaching and accumulation in surface and groundwater

A

True

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18
Q

A plant can be classified as a weed if it:
A. Causes economic loss to a crop
B. Is harmful to humans and livestock
C. Is detrimental to wildlife or ecosystem
D. All answers are correct

A

D. All answers are correct

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19
Q 
Weeds that are especially injurious are classified by the government as: 
        A. Toxic 
        B. Noxious 
        C. Non-Native 
        D. Exotic
A

B. Noxious

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20
Q 
The long-term persistence of a certain annual weed species is most likely due to: 
        A. Extensive root system
        B. Herbicide resistance 
        C. High seed production 
        D. Tolerance to tillage
A

C. High seed production

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21
Q

A weed that reproduces asexually is most likely:
A. An Annual
B. A Biennial
C. A Perennial
D. None of these answers are correct

A

C. A Perennial

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22
Q 
Milk sickness is caused when people drink milk from cows who have consumed which weed? 
        A. Poison Ivy 
        B. Musk Thistle 
        C. Pigweed 
        D. White Snakeroot
A

D. White Snakeroot

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23
Q 
The first defense against weeds is: 
        A. Prevention of establishment 
        B. Herbicides 
        C. Tillage 
        D. Biocontrols
A

A. Prevention of establishment

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24
Q 
Which agency of the USDA is responsible for preventing the introduction of noxious weeds? 
        A. EPA 
        B. APHIS 
        C. ARS 
        D. NRCS
A

B. APHIS

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25
Q 
Which agency is responsible for approving new herbicides? 
        A. EPA 
        B. APHIS 
        C. ARS 
        D. NRCS
A

A. EPA

26
Q 
In what year were genetically engineered crops first introduced? 
        A. 1991
        B. 1993
        C. 1996
        D. 1998
A

C. 1996

27
Q 
Which type of ingredients are added to a herbicide formulation to facilitate application and handling or to increase activity? 
        A. Active Ingredients 
        B. Inert Ingredients 
        C. Chemical Ingredients 
        D. Restricted Ingredients
A

B. Inert Ingredients

28
Q 
LD50 is a measure of: 
        A. Dispersion 
        B. Toxicity 
        C. Activity 
        D. Suspension
A

B. Toxicity

29
Q 
The mode of action of glyphosate is: 
        A. Growth Regulator 
        B. Photosynthesis Inhibitor 
        C. Amino Acid Synthesis Inhibitor 
        D. Cell Membrane Disrupter
A

C. Amino Acid Synthesis Inhibitor

30
Q 
The mode of action for 2,4-D is: 
        A. Growth Regulator 
        B. Photosynthesis Inhibitor 
        C. Amino Acid Synthesis Inhibitor 
        D. Cell Membrane Disrupter
A

A. Growth Regulator

31
Q 
The mode of action for atrazine is: 
        A. Growth Regulator 
        B. Photosynthesis Inhibitor 
        C. Amino Acid Synthesis Inhibitor 
        D. Cell Membrane Disrupter
A

B. Photosynthesis Inhibitor

32
Q 
Which type of herbicide is applied to foliage? 
        A. Pre Emergence 
        B. Pre Plant 
        C. Systemic 
        D. Contact
A

D. Contact

33
Q 
Which type of herbicide would be most useful on an established perennial weed? 
        A. Pre Emergence 
        B. Pre Plant 
        C. Systemic 
        D. Contact
A

C. Systemic

34
Q 
Which would NOT be an appropriate strategy to prevent herbicide resistance? 
        A. Crop Rotation 
        B. Using Extra Herbicide 
        C. Herbicide Rotation 
        D. Tillage
A

B. Using Extra Herbicide

35
Q 
Grassy weeds would be easiest to control in which crop?
        A. Corn 
        B. Wheat 
        C. Soybean 
        D. Oats
A

C. Soybean

36
Q

Weeds that live on land are classified as ________, whereas those that are a problem in water are _______

A

Terrestrial and Aquatic

37
Q

The three life cycles weeds can be classified by are _______, _______ and _______

A

Annual, Biennial and Perennial

38
Q

_______ annual weeds are those that germinate in the fall, are vegetative in the winter and flower in the following spring

A

Perennial

39
Q

Biennial plants require _______ season to complete their life cycle

A

Two

40
Q

Rye infected with Claviceps purpurea forms ________

A

Ergot

41
Q

The reservoir of weed seeds in the soil is called the ______

A

Seed Bank

42
Q

Weed can develop _______ to herbicides with detoxifying or morphological modifications

A

Biotypes

43
Q

The most widely used herbicide is ________

A

Round Up

44
Q

On its label, an herbicide has three names, including the _______ name, the _______ name and the _______ name

A

Common, Trade and Chemical

45
Q

_______ use pesticides present little danger to humans or the environment, whereas _______ use pesticides are harmful to humans or the environment

A

General and Ristricted

46
Q

The types of herbicide application based on timing are _______, ________, ________ and ________

A

Pre-plant, Pre-Emergent, Post-Emergent and Post-Harvest

47
Q

Bull Thistle

A

Biennial

48
Q

Pigweed

A

Summer Annual

49
Q

Jimson Weed

A

Summer Annual

50
Q

Bermuda Grass

A

Perennial

51
Q

Canada Thistle

A

Perennial

52
Q

Velvetleaf

A

Summer Annual

53
Q

Leafy Spurge

A

Perennial

54
Q

Shepherd’s Purse

A

Winter Annual

55
Q

Dandelion

A

Perennial

56
Q

Musk Thistle

A

Biennial

57
Q

Johnsongrass

A

Perennial

58
Q

Chickweed

A

Winter Annual

59
Q

Caution

A

Category III

60
Q

Warming

A

Category II

61
Q

Danger

A

Category I

62
Q

Poison

A

Category I

Crops (14 decks)

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