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AGRONOMY EXAM SOLVED AND APPROVED ANSWERS -6
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AGRONOMY EXAM SOLVED AND APPROVED ANSWERS -6
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AGRONOMY EXAM SOLVED AND APPROVED ANSWERS #6A weed is any plant growing where it is not wanted - correct answer True
The term weed is normally applied to unwanted plants in human-made settings such as
gardens, lawns, agricultural areas, parks, woods, and other natural areas - correct
answer True
A weed as defined in agriculture is a plant that causes economic loss to a valuable crop,
are harmful to humans and livestock, and or detrimental to wildlife and ecosystems -
correct answer economic loss, livestock
How many years can a weed seed stay in the soil? - correct answer 40 years
Federal and state governments have categorized weeds that are especially undesirable
are called noxious weeds - correct answer Noxious
What is the name of the Japanese vine that is invasive in thesoutheastern US - correct
answer Kudzu
The Canada thistle is a __________ plant that reproduces from vegetative buds in its
root system and from seeds - correct answer perennial
Itch grass is native to where? - correct answer old world tropics
Salt cedar plants were introduced as an ornamental from Asia. What part of the US is it
primarily located in? - correct answer Western US
Hydrilla is found in and adversely impacts what type of habitats - correct answer Fresh
water
Weeds are classified by certain characteristics. Select four from the list below. - correct
answer the environment they grow in, life cycles, invasiveness, and taxonomy
Invasive Plants are nonnative plants (this includes noxious weeds)that become
established in natural plant areas - correct answer True
Invasive plants have the ability to reproduce rapidly and to spread byseed or asexual
means. - correct answer True
A Chinese tallow tree is considered to be invasive - correct answer True
Bahia grass is an invasive species that was brought to America in 1891 - correct answer
False
Terrestrial weeds grow where? - correct answer land
, Aquatic weeds grow where? - correct answer in fresh water
Aquatic weeds can cause problems by: (select two from the following answers - correct
answer clog irrigation, canals and waterways, destroy wetland and lake ecosystems
Select 4 types of annual weeds from the following list. - correct answer barnyard grass
(in lawns), chickweed (in winter wheat), cocklebur (toxic seeds), and morning glory/ field
bindweed
Perennial weeds can live for _____year(s). - correct answer 3 or more years
Johnson grass is native to what region of the world. - correct answer Mediterranean
What year was Johnson grass introduced in the US? - correct answer 1830
Perennial Weeds are the easiest of the three weed types to control. - correct answer
False
Perennial Weeds, once established, are difficult to control except by herbicides. -
correct answer True
APHIS (Animal and Plant Heath Inspection Service) is a multi-facetedagency with a
broad mission to: (select all that apply) - correct answer regulates GMO use, monitors
introduced plant and animal species for diseases, noxious weeds, etc., administers
animal welfare act, protects and promotes US agricultural health, wildlife damage
management
USDA stands for - correct answer United States Department of Agriculture
TDA stands for - correct answer Texas Department of Agriculture
The Primary method of weed prevention in conventional agriculture is? - correct answer
herbicide
Advantages of herbicides include ,reduced costs versus mechanical(hand or shred),
greater flexibility in timing of weed control, very effective in eliminating target species,
and eliminate the need for mechanical tillage - correct answer True
Disadvantages of herbicides are that it can kill non-target species, contamination (soil,
water, etc.), can lead to resistant weed species that are difficult to control, and human
error in application - correct answer True
Widespread development of modern herbicides occurred after _ - correct answer WWII
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