Module 1 Flashcards
1
Q
The way most weeds are spread is due to
A
Human activity
2
Q
Natural weed seed dispersal mechanisms include
A
- Having seed move into irrigation canals and then using irrigation water
- By ingestion by animals and then later in the feces
3
Q
A major way which Russian Thistle (a tumbleweed) moves is through
A
Wind Dispersal
4
Q
Based on the field maps for ragweed
A
The location of ragweed was somewhat stable but the densities to cause a specific yield loss varied
5
Q
Annual and Biennials ONLY reproduce from seed
A
True
6
Q
A biennial will flower at the same time in its life cycle as a winter annual
A
False
7
Q
Characteristics of successful weeds include
A
- Looks like the crop
- Delayed seed germination
- Unpalatable
- Produces lots of seed
8
Q
The origins of weeds include
A
- Introducing a plant due to it’s beauty and then having no natural enemies became a nuisance
- Introducing plant materials that did well as crops in other places and then escaped
9
Q
Definition of a Weed
A
- Any plant that you think does not belong
- Defined by the person who is thinking about the plant and it’s arbitrary
10
Q
Researchers believe that Canada Thistle infestations first arrived in the US due to transport in crop seed from China
A
False
