Exam 1 Review Flashcards
Most agricultural weeds are
r-strategist
The family that comes second in terms of the greatest number of the world’s worst weeds after Poaceae
Asteraceae
A group of populations that co-occur in the same space and the same time is known as
community
When two or more plants of the same species coexist in the same time and space and make simultaneously demand for a limited resource, the competitive situation is called
intraspecific
Which of these photosynthetic pathways do you think grasses generally have
C4
Glyphosate (Roundup) was introduced in the
1970s
Johnsongrass is an example of a
perennial
Which of these is considered as the 1st exotic plant pathogen for successful control of rush skeletonweed?
puccinia chondrillina
Duckweed is a — type of weed
floating
Which of these is an example of a noxious weed
Japanese dodder
Cheeseweed is a —- plant
C3
The family with the greatest number of the world’s worst weeds is
Poaceae
Redroot pigweed is —– plant
short-day
An example of a biennial plant is
Bull Thistle
Most small seeded annual weeds are
r-strategist
Prostrate spurge is a — plant
C4
In crop-weed competition the nutrient that becomes limited first is
N
Weed seeds with hard seed coats have to be a — in order to germinate
scarified
The fluffy structure that helps Asteraceae weed seeds disseminate is called
pappus
When seeds fail to germinate under normally ideal environment because of conditions within the seed the process is called
innate
Summer annual weeds generally flower and set seed in
fall
Use of cover crops for weed control is an example of
cultural control
Which of these species can be toxic to horses
yellow star thistle
