AGRONOMY 114 EXAM I Page 1
NAME:
DIRECTIONS:
MARK THE ONE BEST ANSWER ON YOUR
ANSWER SHEET.
1.
Mitochondria
a) are sites of photosynthesis
b) contain chromosomes
c) are a part of the vacuole
d) are found in the cytoplasm
e) are directly involved in protein
synthesis
2.
The soybean canopy structure and row width associated with
the interception of the least amount
of solar radiation is
a) open; 7".
b) closed; 12".
c) open; 14".
d) open; 30".
e) closed; 30".
3.
Which statement is true for farmers
a) farmers can't influence the climate
b) climate rarely influences farmers
c) farmer behavior is not usually
influenced by climate
d) farmers can greatly influence the
climate of field crops
e) climate is to be seen, not heard,
by farmers
4.
Environment "A" has a temperature of 90 degrees F and envi-
ronment "B" is at 80 degrees
F. Both environments "A" and
"B" contain 50% relative
humidity. Which of the following
statements is true?
a) hay will dry slower in
"A" than "B" because of more
moisture in the atmosphere
b) hay will dry equally fast under
both "A" and "B"
c) "A" can hold more
moisture than "B"
d) "B" will permit more
transpiration than "A"
e) drought conditions will occur earlier
in "B" than "A"
5.
The troposphere, compared to other atmospheric layers,
a) has the greatest climatic
variability
b) contains the ozone layer
c) is the warmest part of the
atmosphere
d) absorbs ultraviolet light from the
sun
e) reflects radio waves back to earth
6.
The air movement around the center of a low pressure area is
a) upward and clockwise
b) upward and counter-clockwise
c) downward and counter-clockwise
d) downward and clockwise
e) west to east
AGRONOMY 114 EXAM I A Page 2
7.
Bacterial pustule is a disease caused by pathogens in what
kingdom?
a) Monera
b) Xanthomonas
c) Plantae
d) Protista
e) Magnoliophyta
8.
You were shown a formula for calculation of Growth Degree
Days, a concept to determine zones of
adaptation of corn
hybrids. Which of the following formulae is correct?
a) (Max. temp + min. temp)/2 + 50 degrees
b) (Max. temp - min. temp)/2 + 50 degrees
c) (Max. temp + Min. temp)/2 - 50 degrees
d) (Max. temp - Min. temp)/2 - 50 degrees
9.
Which crop would be best suited as a companion crop to red
clover?
a) corn
b) small grain
c) alfalfa
d) smooth bromegrass
e) indiangrass
10.
Which row of soybeans in a field that bordered a mowed lawn
would likely be delayed in maturity?
a) the outside border row
b) the second row from the outside
c) the fifth row from the outside
d) the middle row of the field
e) the row that was tallest
11.
Grasses are known as monocotyledonous plants because
a) the grass plant has one radicle
b) the grass plant has one coleoptile
c) the grass caryopsis has one
scutellum
d) the grass plant has one seminal
root
e) the grass plant has one pericarp
12.
A monoecious plant would definitely have
a) imperfect flowers
b) nitrogen fixing roots
c) a fibrous root system
d) net veined leaves
e) epigeal germination
13.
The function of the epicotyl is
a) to absorb nutrients for the cotyledons
b) to produce the cotyledons
c) to develop the above ground portion
of the plant
d) to push the coleoptile to the soil
surface
e) to elongate during epigeal
emergence
AGRONOMY 114 EXAM I A Page 3
14.
Transpiration is important for crop photosynthesis because the
process
a) lowers night-time respiration
b) lowers NAR
c) increases the vapor pressure
deficit
d) keeps leaves from overheating
e) improves LAI
15.
Which factor would increase the chances of a killing frost in a
watermelon field
a) hilltop (vs. bottomland) location
b) cloudy night (vs. clear night)
c) uncultivated (vs. cultivated) soil
d) sandy (vs. clay) soil
e) planted at 1 inch deep (vs. 2
inches deep)
16.
The translocation of a herbicide from the leaves of a plant
to the rhizomes would
a) be mostly through the xylem
b) proceed along the cuticle
c) be mostly through the phloem
d) be mostly through the rachis
e) be mostly through the rachilla
17.
A crop that is used to attract an insect species in order to
prevent damage to a primary crop is
known as
a) an emergency crop
b) a trap crop
c) a catch crop
d) an attractant crop
e) a detractant crop
18.
The region in which production would most likely be increased
by summer-fallowing is
a) subarid
b) semiarid
c) subhumid
d) humid
e) perhumid
19.
Some berry crops in California are grown in beds covered with
plastic using drip irrigation. Plastic is used to
a) reduce humidity
b) reduce evaporation
c) reduce air temperature
d) reduce wind speed
e) reduce transpiration
20.
An Ames adapted variety of soybeans was planted May 20 near Ames,
Iowa and at the same date near St.
Paul, Minnesota. If the
temperature was the same at both locations from planting until
flowering
a) the field near St. Paul would
flower first
b) the field near Ames would grow
taller
c) the field near Ames would flower
first
d) the two fields would flower at the
same time
e) the plants in the two fields would
be the same height
AGRONOMY 114 EXAM I A Page 4
21.
In areas which have prevailing westerly winds, cold sensitive
fruit crops are most likely to be found on the
a) west side of a large lake
b) east side of a large lake
c) south side of a large forest
d) north facing slopes on hills
22.
Two weeks after a 12 inch snowfall, why would snow first melt in a
space six inches around tree trunks
before the rest of the snow?
a) It is due to heat radiation of the
tree trunks in winter.
b) It is due to the heat of
respiration of the tree.
c) It is a function of transpiration
of water.
d) It is due to a micro-windbreak
effect of the tree trunk.
e) It is due to heat absorption of the
tree during clear nights.
23.
Which of the following plant families is the most important
in food production?
a) Moraceae
b) Rosaceae
c) Leguminoseae (Fabaceae)
d) Pinaceae
e) Cruciferae
24.
One day scientists may develop a perennial sorghum plant to
improve food production in Africa.
Compared to its annual
counter part, perennial sorghum would
probably have relatively
a) lower yields
b) a smaller root system
c) a longer photoperiodic response
d) a bell-shaped growth curve
e) higher nitrogen fixation rates
25. Transpiration rates can be
decreased by
a) increasing the relative humidity
near the leaf
b) stirring the air in the crop canopy
on a hot, still day
c) growing plants that have more
stomates
d) growing plants that have thinner
cuticles
e) increasing etiolation
26.
Poor crop stands of field beans are most likely to result from
what injured seedling part?
a) petiole
b) coleoptile
c) cuticles
d) hypocotyl
e) pistil
27.
One of the biggest differences between animals and plants is
that animals lack
a) a nucleus in the cell
b) vascular cambium
c) ribosomes
d) vacuoles
e) plasma membrane
AGRONOMY 114 EXAM I A Page 5
28.
An increase in which factor would best improve rhizome growth
in a bluegrass pasture managed for
cattle grazing?
a) fertilizer
b) snow cover
c) hot temperatures
d) soil compaction
e) axillary bud regrowth
29.
The most common way farmers increase the LAI in their corn
fields is
a) using nitrogen fertilizer
b) using narrow rows
c) irrigating
d) using higher plant populations
e) applying growth hormones
30.
Farmers in California have turned on sprinklers at night to
prevent their strawberry crop from
frost damage due to low air
temperature. This is done to keep the leaf temperature
a) above freezing
b) above 28? F
c) above ambient air temperature
d) equal to the relative humidity
e) above the respiration temperature
31.
Which of the following cannot be found in or as a part of a
raceme inflorescence?
a) spikelets
b) rachis
c) florets
d) panicle branch
e) pedicel
32.
If hail destroyed the growing point of a broadbean crop in
Nigeria, what should the farmer do?
a) grow a catch crop of something
similar
b) replant the crop
c) spray the crop with a pesticide
d) grow a companion crop
e) check for axillary buds
33.
Which crop-use doesn't match properly?
a) cotton-shirt
b) corn-ethanol
c) wheat-cake
d) barley-beer
e) sunflower-sweetener
34.
Which crop would be best for controlling soil erosion?
a) corn
b) switchgrass
c) sorghum
d) soybeans
e) alfalfa
AGRONOMY 114 EXAM I A Page 6
35.
Many French crops are also common to the Midwest. Oats
are a good example. What is the French word for oats?
a) le ble (Triticum aestivum)
_________________
b) l'orge (Hordeum vulgare)
_______________
c) l'avoine (Avena sativa)
____________
d) le mais (Zea mays)
________
e) soya (Glycine max)
___________
36.
Theoretically, if atmospheric CO2 levels double in the next
century, the yields of which crop
would most drastically
increase?
a) soybean
b) corn
c) sorghum
d) day neutral crops
e) long-day crop
37.
An example of a pulse crop is
a) sunflower
b) popcorn
c) cotton
d) peanuts
e) wheat
38.
Plant auxins include
a) NAR
b) phosphon
c) phytochrome
d) triphosphate
e) indolacetic acid
39.
In some arid areas of the northern hemisphere, some farmers can
grow wheat on less than 25 cm (10
inches) of rain without
irrigation. How would they do this?
a) plant biennials in winter
b) plant perennials in spring
c) plant summer annuals in spring
d) plant winter annuals in fall
e) plant spring annuals in spring
40.
Stipules are found on
a) wheat
b) oats
c) corn
d) soybeans
e) barley
41.
High light intensity on the stalks of plants would result in
a) shorter plants
b) taller plants
c) more indolacetic acid in the stalks
d) more triiodobenzoic acid in the
stalks
e) weaker stalks
AGRONOMY 114 EXAM I A Page 7
42.
The major portion of the absorption of minerals and water is
most likely to take place
a) in the zone of maturation
b) in the root cap
c) in the zone of cell division
d) in the top portion of a 3 foot tap
root
e) in the zone of elongation
43.
Total world production of which crop is greatest?
a) corn
b) barley
c) wheat
d) soybeans
e) sorghum
44.
The scientific name of corn in Scotland is
a) Sorghum bicolor
b) Zea mays
c) Glycine max
d) Lucerne sativa
e) hard to answer
45.
The main reason an alfalfa farmer would not cut alfalfa for hay
late in the fall after the first
killing frost would be to
a) maintain good carbohydrate
concentrations in the roots
b) provide better regrowth for winter
growing conditions
c) to help catch snow and better
protect the living alfalfa
plants during harsh winter
temperatures
d) reduce the necessary inoculation
rates for next year's
production
46.
Which of the following crops would give the greatest response
to applied nitrogen?
a) sweet clover
b) red clover
c) oats
d) alfalfa
e) birdsfoot trefoil.
47.
The following is characteristic of the photosynthesis process
a) occurs in both plants and animals
b) uses water and CO2 as raw materials
c) release CO2
d) breaks down carbohydrates
e) occurs without radiant energy
48.
If a grain weevil consumed the insides of a barley kernel so
only the shell of the kernel remained,
what kernel part would
be left?
a) coleoptile
b) scutellum
c) cotyledon
d) endosperm
e) pericarp
AGRONOMY 114 EXAM I A Page 8
49.
Plant breeders have tried to improve the "standability" of
alfalfa for ease of mowing and baling
for hay. Unfortunately,
this approach has been associated with
a) increases in plant toxins
b) lower NAR
c) lower LAI
d) lower transpiration
e) decreased digestibility
50.
The following plant would be properly classified as
dicotyledonous
a) corn
b) oats
c) orchardgrass
d) barley
e) alfalfa
AGRONOMY
114 EXAM I
(Answers may not be 100% correct; check with instructor if questionable)
Item
Answer
1 4
2 4
3 4
4 3
5 1
6 2
7 1
8 3
9 2
10 1
11 3
12 1
13 3
14 4
15 4
16 3
17 2
18 2
19 2
20 3
21 2
22 1
23 3
24 1
25 1
26 4
27 2
28 1
29 4
30 2
31 4
32 5
33 5
34 2
35 3
36 1
37 4
38 5
39 4
40 4
41 1
42 1
43 3
44 5
45 3
46 3
47 2
48 5
49 5
50
5