CRSS 4340 Test 1 With Complete
Solution
Definitions of Weeds - ANSWER -A plant out of place
-A plant that interferes with or reduces farm productivity
-A plant that thrives in habitats disturbed by people or a pioneer of
secondary succession
-A plant growing where it is not wanted
-Any vegetation that interferes with the objectives of people
Ralph Waldo Emerson - ANSWER A weed is a plant whose virtues have not
yet been discovered
Families of the world's worst weeds - ANSWER -Mustard
-Amaranths
-Compositae
-Legume
-Sedges
Characteristics of Weeds (1) - ANSWER Germination requirements fulfilled in
many environments
Characteristics of weeds (2) - ANSWER Discontinuous germination (internally
controlled) due to great longevity of seed
,Characteristics of weeds (3) - ANSWER Rapid growth through vegetative
phase to flowering
Characteristics of weeds (4) - ANSWER Continuous seed production for as
long as growing conditions permit
Characteristics of weeds (5) - ANSWER Self-compatibility but not autogamy
or apomixis (plant can fertilize itself)
Characteristics of weeds (6) - ANSWER Cross-pollination, when it occurs, by
unspecialized visitors or wind
Characteristics of weeds (7) - ANSWER Very high seed output in favorable
environmental circumstances
Characteristics of weeds (8) - ANSWER Production of some seed in wide
range of environmental conditions; tolerance and plasticity
Characteristics of weeds (9) - ANSWER Adaptations for short-distance and
long-distance dispersal
Characteristics of weeds (10) - ANSWER If perennial, vigorous vegetative
reproduction or regeneration from fragments
Characteristics of weeds (11) - ANSWER If perennial, brittleness, so as to not
be drawn from the ground easily
Characteristics of weeds - ANSWER Ability to compete interspecifically by
special means
Characteristics used to positively identify grasses - ANSWER -Ligules
-Auricles
-Sheaths
, -Vernation
-Stem types
-Seedheads
-Midvein
-Pubescence
Simple Perennial - ANSWER overwinter by means of a vegetative structure,
such as a perennial root with a crown, but reproduce new plants almost
entirely by seed. Do not spread by means of vegetative structures
Simple perennial examples - ANSWER -Buckhorn Plantain
-dandelions
Winter annual - ANSWER complete life cycle during period from fall to spring
(care when preparing land for summer crops or when growing winter crops)
-germinate in fall and set seed in spring
winter annuals (grasses) - ANSWER -italian ryegrass
-annual bluegrass
winter annuals (broadleaf weeds) - ANSWER -chickweed
Solution
Definitions of Weeds - ANSWER -A plant out of place
-A plant that interferes with or reduces farm productivity
-A plant that thrives in habitats disturbed by people or a pioneer of
secondary succession
-A plant growing where it is not wanted
-Any vegetation that interferes with the objectives of people
Ralph Waldo Emerson - ANSWER A weed is a plant whose virtues have not
yet been discovered
Families of the world's worst weeds - ANSWER -Mustard
-Amaranths
-Compositae
-Legume
-Sedges
Characteristics of Weeds (1) - ANSWER Germination requirements fulfilled in
many environments
Characteristics of weeds (2) - ANSWER Discontinuous germination (internally
controlled) due to great longevity of seed
,Characteristics of weeds (3) - ANSWER Rapid growth through vegetative
phase to flowering
Characteristics of weeds (4) - ANSWER Continuous seed production for as
long as growing conditions permit
Characteristics of weeds (5) - ANSWER Self-compatibility but not autogamy
or apomixis (plant can fertilize itself)
Characteristics of weeds (6) - ANSWER Cross-pollination, when it occurs, by
unspecialized visitors or wind
Characteristics of weeds (7) - ANSWER Very high seed output in favorable
environmental circumstances
Characteristics of weeds (8) - ANSWER Production of some seed in wide
range of environmental conditions; tolerance and plasticity
Characteristics of weeds (9) - ANSWER Adaptations for short-distance and
long-distance dispersal
Characteristics of weeds (10) - ANSWER If perennial, vigorous vegetative
reproduction or regeneration from fragments
Characteristics of weeds (11) - ANSWER If perennial, brittleness, so as to not
be drawn from the ground easily
Characteristics of weeds - ANSWER Ability to compete interspecifically by
special means
Characteristics used to positively identify grasses - ANSWER -Ligules
-Auricles
-Sheaths
, -Vernation
-Stem types
-Seedheads
-Midvein
-Pubescence
Simple Perennial - ANSWER overwinter by means of a vegetative structure,
such as a perennial root with a crown, but reproduce new plants almost
entirely by seed. Do not spread by means of vegetative structures
Simple perennial examples - ANSWER -Buckhorn Plantain
-dandelions
Winter annual - ANSWER complete life cycle during period from fall to spring
(care when preparing land for summer crops or when growing winter crops)
-germinate in fall and set seed in spring
winter annuals (grasses) - ANSWER -italian ryegrass
-annual bluegrass
winter annuals (broadleaf weeds) - ANSWER -chickweed
