A weed is any plant growing where it is not wanted. - 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. - True
A weed as defined in agriculture is a plant that causes ________ to a valuable crop, are harmful to
humans and livestock, and/or detrimental to ____ and ecosystems - Economic loss, wildlife
How many years can a weed stay in the soil? - 40 years
Federal and state governments have categorized weeds that are especially undesirable are called ____
weeds - Noxious
What is the name of the Japanese vine that is invasive in the Southeastern US? - Kudzu
The Canada thistle is a ___ plant that reproduces from vegetative buds in its root system and from
seeds. - Perennial
Itchgrass is native to where? - Old world tropics
Saltcedar plants were introduced as an ornamental from Asia. What part of the US is it primarily located
in? - Western US
Hydrilla is found in and adversely impacts what type of habitats. - Fresh Water
Weeds are classified by certain characteristics. Select four from the list below. - 1. The environment they
grow in
2. Life cycles
3. Invasiveness
, 4. Taxonomy
Invasive plants are nonnative plants (this includes noxious weeds) that become established in natural
plant areas. - True
Invasive plants have the ability to reproduce rapidly and to spread by seed or asexual means. - True
A Chinese tallow tree is considered to be invasive. - True
Bahia grass is an invasive species that was brought to America in 1891. - False
Terrestrial weeds grow where? - on land
Aquatic weeds grow where? - in fresh water
Aquatic weeds can cause problems by: (select two from the following answers) - 1. Clog irrigation canals
and waterways
2. Destroy wetland and lake ecosystems
Select 4 types of annual weeds from the following list. - 1. Barnyard grass (in lawns)
2. Chickweed (in winter wheat)
3. Cocklebur (toxic seeds)
4. Morning glory/field bindweed
Perennial weeds can live for ____ year(s). - 3 or more years
Johnson grass is native to what region of the world? - Mediterranean
What year was Johnson grass introduced in the US? - 1830
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