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Plant Propagation
Test Description: Plant Propagation Review for PSI
Instructions: Answer all questions to get your test result.
1) What is the primarily source of food for the developing embryo in the seeds of grass plants?
A
cotyledons
B
endosperm
C
suspensor
D
amylose
2) Which plant hormone plays the largest role in activating seed germination?
A
ethylene
B
abscisic acid
C
auxin
D
gibberellin
3) What is a seed dormancy mechanism that prevents the seed of certain plant species from germinating in late fall or early winter?
A
stratification
B
vernalization
C
phototropism
D
scarification
4) Why have plants evolved with seed dormancy mechanisms?
A
Dormancy mechanisms limit the number of seedlings that survive, which is a form of natural selection.
B
Dormancy mechanisms increase seedling survival by allowing germination when conditions are favorable
C
Dormancy mechanisms allow the seed to germinate under a wide range of environmental conditions.
D
Dormancy mechanisms reduce the likelihood that seedlings will compete with the mother plant.
5) What is scarification?
A
A seed dormancy mechanism that involves a period of cold temperature.
B
The enzymatic degradation of gibberellins allowing seed germination.
C
A seed dormancy mechanism that involves breaking down the seed coat.
D
The process by which seeds recognize moisture and temperature levels.
6) Which is the optimal temperature range for the germination of most seeds?
A
44 to 59 degrees Fahrenheit
B
60 to 80 degrees Fahrenheit
C
86 to 96 degrees Fahrenheit
D
30 to 40 degrees Fahrenheit
7) Which of the following are characteristics of a good germination medium?
A
high bulk density, good packing abilities, and good water holding capacity
B
fine textured, good water holding capacity and aeration, and sterile
C
silty-loam texture, large pores, moderate fertilization, and free of weed seeds
D
coarse textured, high nutrient levels, looseness, and pasteurized
8) What is the first stage of seed germination?
A
absorption of water
B
embryo enlargement
C
increased metabolism
D
root and shoot elongation
9) What is the best explanation as to why seeds of many plants have to be sowed below the soil surface in order to germinate?
A
Those seeds require bacterial action on the seed coat.
B
Those seeds require darkness in order to germinate.
C
Those seeds require the cool temperatures of the soil.
D
Those seeds require lower levels of carbon dioxide.
10) A plant propagator might treat certain seeds with an acid bath before sowing. To which process is this most closely related?
A
vernalization
B
scarification
C
stratification
D
acidification
11) Why would a horticulturist apply the technique known as indirect seeding?
A
to improve both germination and survival rates
B
to lessen the amount of growing medium used
C
to reduce the amount of production labor
D
to increase the length of the growing season
12) Why is it a common practice to keep plants being propagated by sexual and asexual means warmer than established plants?
A
Warmth inhibits the growth of fungi.
B
Warmth speeds metabolic processes.
C
Warmth makes nutrients readily available.
D
Warmth promotes evapotranspiration.
*select an answer for all questions
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