Exam 1 example Review Flashcards
The family that comes second in terms of the greatest number of the world’s worst weeds after Poaceae is
Asteraceae
Summer annual weeds generally flower and set seed in
fall
Winter annual weeds generally flower and set seed in
spring
Annual bluegrass is an example of a
winter annual
Black nightshade is an example of a
summer annual
Bull thistle is an example of a
biennial
Field bindweed is an example of a
perennial
Barnyardgrass is an example of a
C4 plant
Weeds that remain partially above water and do not change with the level of water are called
emersed
Cattail is a — type of weed
emersed
The stems that grow along the surface, from which roots and shoots arise the following year are called
stolons
Sedges generally propagate by
rhizomes
Which of these is an example of a parasitic weed
broomscape
The failure of weed seeds to germinate even when the environment conditions are favorable for germination is called
dormancy
Weeds compete with crops for
water, nutrients, and light
When two more species coexist in time and space and make simultaneously demand for a limited resource the competitive situation is called
interspecific
The weed density at which the value of the loss due to weed competition exceeds the cost of control is called
economic threshold
The terms used to describe the consumption of weed seeds by insects is called
predation
To be considered noxious, a plant has to be listed on a noxious weed list maintained by
CDFA
Those weeds that are prohibited until more information as to their invasiveness can be determined fall under which of these noxious rating
Q
The grass carp was successful in controlling which of these species in Imperial District
Hydrilla
Which of these is considered as the 1st exotic plant pathogen for successful control of rush skeletonweed
Puccinia chondrillina
Which of these photosynthetic pathways do you think more competitive plants will have
C4
