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