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Crops 103 > 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 allelopathic properties.

A

False

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7
Q

Over 95 percent 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 crop 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

17
Q

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

A

True

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 ecosystems
D. all answers are correct

A

D. all answers are correct

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

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

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

22
Q

Milk sickness is caused when people drink milk from cows who have consumed which weed?

A. poisen ivy
B. musk thistle
C. pigweed
D. white snakeroot

A

D. white snakeroot

23
Q

The first defense against weeds is”

A. prevention of establishment
B. herbicides
C. tillage
D. biocontrols

A

A. prevention of establishment

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

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 ingredient
B. inert ingredient
C. chemical ingredient
D. restricted ingredient

A

B. inert ingredient

28
Q

LD50 is a measure of:

A. dispersion
B. toxicity
C. activity
D. suspension

A

B. toxicity

29
Q

The mode of action for 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. preemergence
B. preplant
C. systemic
D. contact

A

D. contact

33
Q

Which type of herbicide would be most useful on an established perennial weed?

A. preemergence
B. preplant
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

Crops 103 (21 decks)

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