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PS 103 lab final questions and answers certified 2024
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PS 103 lab final questions and answers certified 2024
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PS 103 lab finalHybrid Corn - correct answer ✔Crosses of inbreds mixes genes and cause
heterosis. (hybrid vigor)
Dent Corn - correct answer ✔harn Horney endosperm at the sides and back
of the kernels. A depression (the dent) forms at the top of the kernel as the
starch endosperm dries and shrinks.
Flint Corn - correct answer ✔hard starch, small starchy endosperm enclosed
in a thick layer of hard endosperm
Flour Corn - correct answer ✔soft starch, no dent, no horny endosperm,
used for production of tortilla and corn chip food products.
Popcorn - correct answer ✔smaller kernel than dent (pointed or round, white
or yellow), optimum popping (unique expansion of starch) (very hard seed
coat, resists steam). very hard, resists steam.
Sweet Corn - correct answer ✔high sugars content/no starch. Dried sweet
corn have a translucent, hard, and shriveled appearance.
Pod Corn - correct answer ✔Primitive features, each kernel is enclosed in a
pod or husk (used for ornamental purposes)
Special Purpose Corn - correct answer ✔modified starch, protein, oil and
other properties (ethanol production). (white corn, waxy corn)
,Corn botanical description - correct answer ✔height: 10-15 ft (dent type),
Stalk: 1-2 in diameter, 10-12 nodes, alternate leaves.
Brace roots - correct answer ✔support
seed and crown roots - correct answer ✔primary systems
Monoecious - correct answer ✔tassels-ears
VE stage corn - correct answer ✔emergence
V1 stage corn - correct answer ✔1st leaf collar, tassel and ear shoots
initiated, seed rows set
V12-16 stages corn - correct answer ✔kernels/ear (size of ear)
VT stage corn - correct answer ✔tassel (2-3 days before sinking), pollen
lives for 24 hours, pollen sheds for 1-2 weeks
R1 stage corn - correct answer ✔silking
R2 stage corn - correct answer ✔blister (10-14 days)
R3 stage corn - correct answer ✔milk (18-22 days)
R4 stage corn - correct answer ✔dough (24-28 days)
, R5 stage corn - correct answer ✔dent (35-42 days)
R6 stage corn - correct answer ✔black layer (55-65 days, 30-35% moisture)
Stress type: VE corn - correct answer ✔soil compaction and seed insects
Stress type: V1-V5 corn - correct answer ✔freeze, weeds and seedling
insects
Stress type: V6-V12 corn - correct answer ✔freeze and nutrient deficiency
Stress type: V12-R1 corn - correct answer ✔extreme heat, hail and drought
Stress type: R3-R5 corn - correct answer ✔stalk insects, freeze and weeds
24-8-16 - correct answer ✔24%N, 8% P2O5 (phosphate), and 16% K2O
(potash)
what factors associated with the soil environment can delay emergence? -
correct answer ✔soil compaction, freezing, herbicide injury, and Fert. on
seedling
what kind of pest feed on corn seed before seedlings emerge? - correct
answer ✔wireworms, seed corn maggot, birds
pollination once pollen grain lands on a silk: - correct answer ✔24 hours
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