PCA: Weeds Exam Study Guide4+Questions and
Answers Verified 100% Correct
Cotyledons - ANSWER first leaf or first pair of leaves produced by the embryo of a seed
plant
First true leaf - ANSWER first leaves to emerge after cotyledons
Collar - ANSWER Region in grasses at the junction of the sheath and blade, often lighter
colored than surrounding tissue
Leaf blade - ANSWER flattened part of leaf
Node - ANSWER Meristematic point on a stem where one or more leaves arise
Internode - ANSWER Segment of plant between nodes
Leaf sheath - ANSWER Basal portion of a leaf, wrapped around the stem above a node.
Almost exclusively monocots
Petiole - ANSWER The stalk of a leaf, which joins the leaf to a node of the stem.
Auricle - ANSWER Small lobe or ear-shaped appendage found at the base of the leaf
blade of grasses. Aids in seedling identification
Ligule - ANSWER A membranous or hairy structure on the inside of a leaf at the junction
of the leaf blade and sheath
,Awn - ANSWER A bristlelike appendage in grasses, usually a continuation of the mid-vein
of the bracts surrounding the flower
Hypocotyl - ANSWER The stem derived from the portion of the embryo located between
the cotyledons and the radicle
Inflorescence - ANSWER cluster of flowers
Coleoptile - ANSWER The covering of the young shoot of the embryo of a grass seed.
Tuber - ANSWER a swollen underground stem
Rhizome - ANSWER a horizontal, underground stem that produces new leaves, shoots,
and roots
Stolon - ANSWER a horizontal branch from the base of plant that produces new plants
from buds at its tips
Bulbs - ANSWER the round parts of some plants that are underground
Recognize the key features used to identify grass seedlings - ANSWER Leaf blade, collar,
ligule, sheath
Recognize the key features used to identify broadleaf seedlings - ANSWER Roots, leaf
arrangement, leaf blade, leaf veins, cotyledons, true leaves
What weeds are poisonous to animals? - ANSWER Jimsonweed, Nightshades, Common
groundsel, coast fiddleneck, yellow starthistle
, Identify types of vegetative propagules. - ANSWER Runners, suckers, stolons, buds,
rhizomes, bulbs
List of unique seed or vegetative growth structures that plants have which aid in
dispersal - ANSWER Plants with burs or spiked seeds that catch in animal fur, plants that
disperse their seed with tumbling plant parts, plants with seed that are pappus-bearing
for dispersal by wind,
plants which spread with vegetative propagules
plants that produce prolific small seed
Examples of plants with burs or spiked seeds that catch in animal fur - ANSWER Filaree,
puncturevine, wild oat, foxtail barley, hare barley
Examples of plants that disperse their seed with tumbling plant parts - ANSWER Russian
thistle
Examples of plants with seed that are pappus-bearing for dispersal by wind - ANSWER
Hairy fleabane, common groundsel, cattails
Examples of plants which spread with vegetative propagules - ANSWER Johnsongrass,
yellow nutsedge, field bindweed
Examples of plants that produce prolific small seed - ANSWER Purslane, pigweed,
smallflower umbrella sedge
List information that should be recorded when monitoring for weeds. - ANSWER What
weeds are present, where weeds are present, weather conditions, stage of weed growth
Answers Verified 100% Correct
Cotyledons - ANSWER first leaf or first pair of leaves produced by the embryo of a seed
plant
First true leaf - ANSWER first leaves to emerge after cotyledons
Collar - ANSWER Region in grasses at the junction of the sheath and blade, often lighter
colored than surrounding tissue
Leaf blade - ANSWER flattened part of leaf
Node - ANSWER Meristematic point on a stem where one or more leaves arise
Internode - ANSWER Segment of plant between nodes
Leaf sheath - ANSWER Basal portion of a leaf, wrapped around the stem above a node.
Almost exclusively monocots
Petiole - ANSWER The stalk of a leaf, which joins the leaf to a node of the stem.
Auricle - ANSWER Small lobe or ear-shaped appendage found at the base of the leaf
blade of grasses. Aids in seedling identification
Ligule - ANSWER A membranous or hairy structure on the inside of a leaf at the junction
of the leaf blade and sheath
,Awn - ANSWER A bristlelike appendage in grasses, usually a continuation of the mid-vein
of the bracts surrounding the flower
Hypocotyl - ANSWER The stem derived from the portion of the embryo located between
the cotyledons and the radicle
Inflorescence - ANSWER cluster of flowers
Coleoptile - ANSWER The covering of the young shoot of the embryo of a grass seed.
Tuber - ANSWER a swollen underground stem
Rhizome - ANSWER a horizontal, underground stem that produces new leaves, shoots,
and roots
Stolon - ANSWER a horizontal branch from the base of plant that produces new plants
from buds at its tips
Bulbs - ANSWER the round parts of some plants that are underground
Recognize the key features used to identify grass seedlings - ANSWER Leaf blade, collar,
ligule, sheath
Recognize the key features used to identify broadleaf seedlings - ANSWER Roots, leaf
arrangement, leaf blade, leaf veins, cotyledons, true leaves
What weeds are poisonous to animals? - ANSWER Jimsonweed, Nightshades, Common
groundsel, coast fiddleneck, yellow starthistle
, Identify types of vegetative propagules. - ANSWER Runners, suckers, stolons, buds,
rhizomes, bulbs
List of unique seed or vegetative growth structures that plants have which aid in
dispersal - ANSWER Plants with burs or spiked seeds that catch in animal fur, plants that
disperse their seed with tumbling plant parts, plants with seed that are pappus-bearing
for dispersal by wind,
plants which spread with vegetative propagules
plants that produce prolific small seed
Examples of plants with burs or spiked seeds that catch in animal fur - ANSWER Filaree,
puncturevine, wild oat, foxtail barley, hare barley
Examples of plants that disperse their seed with tumbling plant parts - ANSWER Russian
thistle
Examples of plants with seed that are pappus-bearing for dispersal by wind - ANSWER
Hairy fleabane, common groundsel, cattails
Examples of plants which spread with vegetative propagules - ANSWER Johnsongrass,
yellow nutsedge, field bindweed
Examples of plants that produce prolific small seed - ANSWER Purslane, pigweed,
smallflower umbrella sedge
List information that should be recorded when monitoring for weeds. - ANSWER What
weeds are present, where weeds are present, weather conditions, stage of weed growth
