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PCA - Weeds Questions with Comprehensive Rationales (2026/2027)

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This document contains questions and verified answers for PCA - Weeds. It includes detailed explanations, revision-focused content, and exam preparation material suitable for 2026/2027 students.

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PCA - Weeds

Absolute sampling - ANS-Sampling to rely each character in a given vicinity

Abutilon theophrasti - ANS-Velvetleaf, Malvaceae

Adjuvant - ANS-Any substance in a system to enhance herbicidal pastime or software
characteristics

Amaranthus retroflexus - ANS-Redroot Pigweed, Amaranthaceae

Amides (propanil) - ANS-Photosynthesis inhibitors

Amsinckia menziesii var. Intermedia - ANS-Coast fiddleneck, Boraginaceae

Annual bluegrass existence cycle - ANS-Winter annual, biennial or perennial

Annual sowthistle existence cycle - ANS-Winter or summer annual

Annual Weed - ANS-Weed plant that completes its existence cycle in 1 year

Aqueous solution (AS), flowable (F), liquid flowable (L) - ANS-Liquid formula requiring agitation
in a spray tank

Auricle - ANS-Small lobe or ear-shaped appendage located at the bottom of the leaf blade of
grasses. Aids in seedling identity

Avena fatua - ANS-Wild oat, Poaceae

Awn - ANS-A bristlelike appendage in grasses, commonly a continuation of the mid-vein of the
bracts surrounding the flower

Banded software - ANS-Application of herbicide to a confined linear strip on or alongside a crop
row rather than a continuous software. Reduces cost of applying high priced herbicides. Applied
to regions that aren't without difficulty cultivated.

Barnyardgrass existence cycle - ANS-Summer annual

Bermuda buttercup lifestyles cycle - ANS-Perennial

Biennial Weed - ANS-Weed that completes its existence cycle in 2 years

,Biotype - ANS-organisms/structures with identical genetic make-up resulting in similarity in look

Bipryidiliums (paraquat, diquat) - ANS-Electron acceptors - PSI (accepts electrons to form toxic
free radicals)

Black medic existence cycle - ANS-Summer or winter annual

Black mustard existence cycle - ANS-Winter or summer annuals, once in a while biennials

Brassica nigra - ANS-Black mustard, Brassicaceae

Broadcast utility - ANS-The uniform utility of a pesticide or other cloth over an entire subject or
region.

Bulbs - ANS-the round components of some flora that are underground

Canarygrass existence cycle - ANS-Winter annual

Capsella bursa-pastoris - ANS-Shepherd's purse, brassicaceae

Cattails lifestyles cycle - ANS-Perennial

Centaurea solstitialis - ANS-Yellow starthistle, Asteraceae

Chemigation - ANS-Applying a pesticide via water, utilized in fumigants

Chenopodium album - ANS-Common lambsquarters, Chenopodiaceae

Coast fiddleneck life cycle - ANS-Winter annuals

Coleoptile - ANS-The masking of the younger shoot of the embryo of a grass seed.

Collar - ANS-Region in grasses on the junction of the sheath and blade, frequently lighter
coloured than surrounding tissue

Common chickweed life cycle - ANS-Winter annual

Common groundsel lifestyles cycle - ANS-Winter annual

Common knotweed existence cycle - ANS-Perennial

Common lambsquarters lifestyles cycle - ANS-Summer annual

, Compare how differing weed germination necessities have an effect on control choices. -
ANS-Seedlings are maximum prone, so different germination necessities will influence the
control decision as to which technique of germination might be used pre- or post-plant

Compare the advantages and disadvantages of various cultivation methods. - ANS-Hand
cultivation: can be closer to the crop but highly-priced to pay for exertions and room for human
mistakes
Mechanical cultivation: less expensive, however time ingesting and frequently needs a team to
hand cultivate at the back of the equipment

Convolvulus arvensis - ANS-Field bindweed, Convolvulaceae

Conya canadensis - ANS-Horseweed, Asteraceae

Conyza bonariensis - ANS-Hairy fleabane, Asteraceae

Cotyledons - ANS-first leaf or first pair of leaves produced by way of the embryo of a seed plant

Cross-resistance - ANS-Phenomenon in which an person plant is proof against two unique
herbicides through the equal mechanism of resistance

Cyperus difformis - ANS-Smallflower umbrella sedge, Cyperaceae

Cyperus esculentus - ANS-Yellow nutsedge, cyperaceae

Cyperus rotundus - ANS-Purple nutsedge, cyperaceae

Dallisgrass lifestyles cycle - ANS-Perennial

Datura stramonium - ANS-Jimsonweed, Solanaceae

Define organic manipulate - ANS-Use of organism or byproducts of dwelling organisms to
suppress or kill pests

Define integrated pest management as used in agricultural weed control applications. -
ANS-The use of organic, bodily, cultural and mechanical manipulate measures to control
agricultural pests and decrease pesticide resistance.

Define mode of movement and the consequences of the usage of an herbicide with a given
mode of action - ANS-Mode of action is the way wherein an herbicide controls a weed. For
example, any herbicide that disrupts cellular membranes may have comparable plant signs and
symptoms.

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