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Crops 103 Ch 17-21 > 15-21 Randomized Questions > Flashcards

15-21 Randomized Questions 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 by 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 than monocots.

A

True

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6
Q

A weed must be alive in order to demonstrate allelopathic traits.

A

False

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7
Q

Over 95% of the corn and cotton crops 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 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 for 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 species

A

False

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17
Q

The main concern with atrazine is leeching and accumulation in surface and ground water

A

True

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18
Q

Management of plant disease depends on whether the disease is biotic or abioitc

A

True

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19
Q

The life cycle of a fungus can involve only one type of spore

A

False

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20
Q

Mycelium is a symptom of fungal disease

A

True/False

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21
Q

Scab is more likely to be a problem in dry/cool areas

A

False

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22
Q

Smut can overwinter in soil plant debris and seed

A

True

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23
Q

Most fungal agents that cause post harvest diseases are introduced to the affected seed

A

False

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24
Q

Bacterial wilt of alfalfa is less an issue today because of resistant varieties

A

True

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25
Q

Plant pathogenic viruses are generally composed of Dna enclosed in a protein case

A

False

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26
Q

Viruses can enter the plant through the stomata

A

False

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27
Q

Fungi can transmit viruses to a plant

A

True

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28
Q

A method to control viral diseases is the use of pesticides

A

False

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29
Q

Insect that damage plants all have mouthparts that pierce

A

False

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30
Q

Many batericides are copper based

A

True

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31
Q

Contact insecticides, once absorbed by the insect, attack the nervous and respiratory systems

A

True

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32
Q

UG99 stem rust has the potential to threaten 20% of the worlds food supply

A

True

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33
Q

A bushel of corn or soybean weighs 60 lbs.

A

False

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34
Q

Seeds at psychological maturity are dry enough for storage

A

False

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35
Q

Generally when soybeans are harvested, the leaves have fallen off the plant

A

True

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36
Q

After combining, grain is clean of residue

A

False

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37
Q

Above optimum moisture levels in seeds increase the rate of respiration

A

True

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38
Q

Grain storage always improves grain quality

A

False

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39
Q

The decision to dry grain crops artificially vs naturally can be dependent on energy

A

True

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40
Q

Harvest forages generally contain mature seed

A

False

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41
Q

Silage yields are usually up to 50% higher per acre than hay yields

A

True

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42
Q

High cell wall content is associated with increased intake and digestibility

A

False

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43
Q

Many modern beef and dairy operation rely more on stored grains than on grazing

A

True

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44
Q

The process of fermentation during silage production turns lactic acid into glucose

A

False

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45
Q

Cotton is mature when the bowels begin to close

A

False

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46
Q

Sugar content is the most important quality for sugar beets

A

False

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47
Q

Potato size is the main determinate in harvesting

A

True

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48
Q

Organic producers are allowed to use GMOs

A

False

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49
Q

Organic agriculture promotes and enhances biodiversity, biological cycles, and environment

A

True

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50
Q

About 10 % of cropland in the US is certified organic

A

False

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51
Q

Organic farmers are inspected by governmental agencies for certification

A

True

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52
Q

Organic food tends to be more expensive

A

True

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53
Q

The term ‘natural’ on a label is equivalent to organic

A

False

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54
Q

The term ‘local’ is regulated by the USDA

A

False

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55
Q

An example of a cultural weed method is tillage

A

False

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56
Q

One disadvantage to delayed planting is potentially lower yields

A

True

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57
Q

Organic farmers choose either cultural or mechanical weed control to manage their weeds

A

False

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58
Q

For organic crops that are used for human consumption raw manure can be applied at any growing season

A

False

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59
Q

Corn cannot persist without human cultivation

A

True

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60
Q

Some corn hybrids are adapted to grow in places with a growing season as short as 70 days

A

True

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61
Q

Flour corn is more resistant to fungi and insects than is flint corn

A

False

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62
Q

Most corn grown today is hybrid corn

A

True

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63
Q

Wheat is adapted to warm tropical climates

A

False

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64
Q

Soft wheat has a greater protein content compared to hard wheat

A

False

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65
Q

Rice is a primary grain crop for over 50 percent of the world’s population

A

True

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66
Q

Rice is very productive when grows under drier conditions

A

True

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67
Q

Rice is very productive when grown under drier conditions

A

False

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68
Q

Wild rice is commonly used as a livestock feed.

A

False

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69
Q

Barley can be used as a substitute for wheat in making raised bread

A

False

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70
Q

Oats are still valued as a feed for horses

A

True

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71
Q

Sorghum ranks fourth in importance world wide as a human food crop after corn, rice, and wheat

A

True

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72
Q

Rice in most of the world is cultivated using highly mechanized techniques

A

True

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73
Q

Sweet sorghum is being investigated as an alternative biofuel

A

False

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74
Q

The first use of soybeans in NA was as a grain crop

A

False

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75
Q

The largest producer of soybeans in the world is the US

A

True

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76
Q

The seed of cultivated soybean is always yellow in colorq

A

False

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77
Q

Determinate soybean varieties are generally grown in the southern states

A

False

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78
Q

Soybeans do not require nitrogen fertilizer

A

True

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79
Q

Peanuts are best adapted to temperature regions

A

False

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80
Q

Alfalfa can have taproots as deep as 20 feet

A

True

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81
Q

Seed production of alfalfa is primarily in Cali and other western states

A

True

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82
Q

Sweet clover was once commonly used as a nitrogen source

A

True

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83
Q

Vetches are commonly grown in tropical regions as green manure crops

A

False

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84
Q

Benefits of using native legumes agronomically include natural adaptation and increase yields

A

True

85
Q

Most of the field pea production in the US is used as dried peas for soup or …

A

True

86
Q

Crimson clover is adapted to hot and dry conditions

A

False

87
Q

Other plant families besides the grass and legume families can have crops of economic value

A

True

88
Q

Potatoes grow best in heavy clay soils

A

False

89
Q

Tobacco crops are generally not allowed to flower and produce seed

A

True

90
Q

The use of tobacco in its many forms can cause many health problems

A

True

91
Q

Sweet poatatoes can be grown as perennials in tropical areas

A

True

92
Q

True yams have modified roots like sweet potatoes

A

True

93
Q

Sugar beets contain 50 % sugar at harvest

A

False

94
Q

Sugar can is the source of 50 % of the world production of sugar

A

True

95
Q

The fiber from cotton is always white

A

False

96
Q

Russian scientists are responsible for breeding for large heads and high seed production in lettuce

A

True

97
Q

Tobacco growers take action to promote flowering when growing tobacco

A

False

98
Q

Opium poppy is a source for legal and illegal drugs

A

True

99
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 the above

A

D. All the above

100
Q

Weeds that are especially injurious are classified by the government as

A

Noxious

101
Q

The long term persistence of a certain annual weed species is most likely due to

A

High seed production

102
Q

A weed that reproduces asexually is most likely

A

A perennial

103
Q

Milk sickness is caused by animal consumption of

A

White snakeroot

104
Q

The first offense against weeds is

A

Prevention of establishment

105
Q

Which agency of the USDA is responsible for preventing the introduction of noxious weeds

A

APHIS

106
Q

Which agency is responsible for approving new herbicides

A

EPA

107
Q

When were genetically engineered crops first introduced?

A

1996

108
Q

Which type of ingredients are added to a herbicide formulation to facilitate application and increase activity

A

Inert

109
Q

LD 50 is the measure of

A

toxicity

110
Q

Mode of action for glyphosate is

A

amino acid synthesis inhibitor

111
Q

The mode of action for 2,4-D is

A

Growth Regulator

112
Q

Mode of action for atrazine is

A

Photosynthesis inhibitor

113
Q

Which type of herbicide is applied to foliage

A

Contact

114
Q

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

A

Systemic

115
Q

Which would not be an appropriate strategy to prevent herbicide resistance

A

Using extra herbicide

116
Q

Grassy weeds would be easiest to control in which crop

A

Soybean

117
Q

The visual response by the plant to the pathogen is

A

A symptom

118
Q

Which of the following is not an abiotic disease factor

A

Parasitic plant

119
Q

Which of the following organisms reproduced by spores

A

Fungus

120
Q

Rust diseases caused by which group of fungi

A

basidiomycetes

121
Q

Stem rust can have up to how may different spore stages?

A

5

122
Q

Damping of affects which growth stage

A

seedling

123
Q

The disease associated with the Salem witch trials is

A

Ergot

124
Q

Leaf spots due to bacteria tend to be

A

Angular

125
Q

Bacterial wilts occur when the bacteria invade the

A

Vascular System

126
Q

Common and halo high affect which crop species

A

Beans

127
Q

Vein clearing is a symptom common in

A

Viral Diseases

128
Q

Which plant family does tobacco mosaic virus primarily infect?

A

Potato Family

129
Q

Aster yellows is caused by which group of organisms?

A

Mycoplasma- like organisms

130
Q

Nematodes are a type of

A

Roundworm

131
Q

The best strategy for nematode control is

A

Crop Rotation

132
Q

The soybean cyst nematode causes damage by

A

Feeding on roots

133
Q

The corn earworm feeds on what part of the corn

A

Kernels

134
Q

The potential biocontrol being evaluated for use on soybean aphid is

A

Binodoxys Communis

135
Q

Corn is typically harvested at moisture levels of

A

25%

136
Q

Soybean is typically harvested at grain moisutre levels of

A

13%

137
Q

Swathing would most likely be a part of harvesting for which crop

A

Oats

138
Q

Manual harvesting of grains was first replaced by whihc machine

A

The reaper

139
Q

The minimum temperature for storage fungi growth

A

40 degrees F

140
Q

The most frequent cause of loss during grain storage is

A

Fungi

141
Q

The loss of forage nutrients during harvest frequently can be up to

A

25%

142
Q

Forage feeding value is described as

A

Forage Quality

143
Q

Thorns would be categorized as

A

Anti Quality Factors

144
Q

As the crop matures from vegetative to Flowering stages, which ofthe following occurs?

A

Forage yield increases, and quality decreases

145
Q

The stalking rate is

A

Animals of Pasture/ Acre

146
Q

The leading hay crop in the US is

A

Alfalfa

147
Q

Drying hay in the field takes about

A

1-5 Days

148
Q

What is the most important determinate of quality in a tobacco crop

A

Nicotine Content

149
Q

Which of the following is allowed in organic ag

A

Compost

150
Q

For how many years must land be without prohibited materials to be certified organic

A

3 years

151
Q

How often are certified organic farms inspected

A

1x a year

152
Q

In terms of organic sales what are the two largest categories

A

Fruits/ Veggies and Dairy

153
Q

The federal program that regualates organic ag in the US is called

A

The National Organic Program

154
Q

The term ‘local’ is defined by congress as ‘food grown not further than’ what distance?

A

400 miles

155
Q

Yields in organic agriculture as compared to conventional agriculture tend to be

A

Equivalent

156
Q

Which is considered to be one of the biggest challenges in organic production

A

Weed control

157
Q

A vigorously growing crop that is used to suppress weeds is

A

Smother crop

158
Q

PRimary tillage can be performed with which of the following

A

Moldboard plow

159
Q

Secondary tillage can be performed with

A

Harrow

160
Q

Which of the following weed control operations has the most potential to damage crops

A

broadcast operations

161
Q

based on acreage and economic value, which crop is most important in the US

A

Corn

162
Q

On a corn plant, the male flowers are called

A

The tassel

163
Q

Which is the most widely grown corn type

A

Dent

164
Q

Which of the following corn types has very little starch?

A

Sweet

165
Q

The leading use of corn is

A

as livestock feed

166
Q

Which of the following is known as the staff of life

A

Wheat

167
Q

the number of tillers on a wheat plant typically ranges from

A

3-5

168
Q

hich type of flower is made by grinding the entire wheat grain

A

whole wheat flower

169
Q

which of the following is used as a cereal grain but is actually a member of the Poaceae Family

A

Buckwheat

170
Q

Wild rice is a

A

Cool season annual plant

171
Q

the two leading states for commercial wild rice production are

A

Cali and Minnesota

172
Q

Which of the following grains is known for the cholesterol lowering capability

A

Oats

173
Q

Grain Sorghum is grown primarily in which two states

A

Texas and Kansas

174
Q

Which of the following is commonly used as a winter cover crop

A

Rye

175
Q

Which of the following grains is adapted to high altitudes

A

quinoa

176
Q

Which of the following is a native grass with potential usage as a biofuel

A

Switchgrass

177
Q

Tall fesque toxosis is due to

A

fungus and tall fesque

178
Q

how many maturity groups do soybeans have

A

13

179
Q

which of the following would be classified as a field bean

A

kidney bean

180
Q

field beans are native to

A

The Americas

181
Q

Field beans need to be cooked becasue

A

the protein will be unavailable

182
Q

Peanuts are native to

A

South America

183
Q

whcih of the following is not generally used as a grain legume

A

alfalfa

184
Q

up to how many times can alfalfa be harvested in a season

A

5 times

185
Q

which of the following is sown on more acres in the US

A

red clover

186
Q

which of the following has stolons

A

white colver

187
Q

for which of the following is birdsfoot trefoil most suited

A

pasture

188
Q

how much of the peanut crop produced in the united states is consumed as peanuts

A

50 percent

189
Q

which of the following is not a typical type for field pea

A

brown

190
Q

white potatoes originated in

A

South America

191
Q

Which of the following crops is not in the nightshade family

A

sweet potato

192
Q

the leading producer of sweet potatoes is

A

asia

193
Q

tapioca is made of

A

cassava

194
Q

which of the following is a native of North America

A

Jerusalem artichoke

195
Q

Taro is grown for which plant part?

A

corms

196
Q

Cassava is which of the following

A

Perennial woody shrub

197
Q

Seeds are produced in sugar beet in the

A

second year

198
Q

plantains are which type of crop?

A

Starch crop

199
Q

Opium poppy is grown for which plant parts

A

sap and seeds

200
Q

Sugar cane is native to which of the following regions?

A

The South Pacific and India

201
Q

The leading fiber crop in the world is

A

cotton

202
Q

Where are the fibers of cotton found?

A

attached to the seeds

203
Q

Where are the fibers of the flax found

A

in the stem

204
Q

the cloth produced from flax is

A

linen

205
Q

flax is which of the following

A

cool season annual

206
Q

which of the following is NOT used as a fiber crop

A

sunflower

207
Q

which of the following is NOT an oil crop?

A

cotton

208
Q

Canola is which of the following

A

a cool season annaul

Crops 103 Ch 17-21 (2 decks)

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