UNIT EXAM INTRO TO HORTICULTURE #17
T/F Only daytime temperatures affect plant growth and development. - correct answer
False
Which are characteristics of a sun leaf? - correct answer smaller
Thicker
Lighter green
The wavelengths of the visible spectrum range from _______________ to
_____________________. - correct answer 380 to 770 nm
____________ are often called accessory or helper pigments because they are excited
by light energy and pass that energy to __________ for use in photosynthesis.
______________ often intensify under cool nights and warm, bright days and are often
responsible for red colors in fall leaves. - correct answer carotenoids
Chlorophyll a
Anthocyanins
Growth slows or stops - correct answer 0 C (32 F)
Proteins are denatured or destroyed - correct answer 50 C (122 F)
Generic minimum threshold temperature for WARM season plants - correct answer 10
C (50 F)
Generic minimum threshold temperature for COOL season plants - correct answer 5 C
(40 F)
Which of the following is the most correct statement about temperature and the rate of
chemical processes?
-As temperature increases, the rate of chemical processes increases exponentially.
-As temperature increases, the rate of chemical reactions decreases.
-As temperature increases, the rate of chemical reactions increases until a maximum
temperature where the relationship breaks down.
-As temperature increases, the rate of chemical reactions remains the same. - correct
answer As temperature increases, the rate of chemical reactions increases until a
maximum temperature where the relationship breaks down.
You are growing peas. Given the following information, how many gdds have
accumulated?
Minimum baseline temperature: 40 F
Maximum threshold temperature: 80 F
Day 1:
Minimum Temperature: 47
Maximum Temperature: 81
, Day 2:
Minimum Temperature: 52
Maximum Temperature: 82
Day 3:
Minimum Temperature: 41
Maximum Temperature: 75
Day 4:
Minimum Temperature: 37
Maximum Temperature: 87 - correct answer 87.5
The best red fall colors occur when days are ________ AND nights are _______
because __________ rates exceed _____________ rates and the excess sugars
increase the production of ___________ - correct answer bright and warm
Cool
Photosynthesis
Respiration
Anthocyanins
The most energy-efficient greenhouse design ______________. - correct answer
minimizes the surface area to volume ratio
T/F Extreme temperatures in either direction can inhibit root growth. - correct answer
True
Good location for temperature sensor - correct answer close to the plants
T/F In greenhouses, growth of crops can be speeded up or slowed down, to a certain
extent, by increasing or decreasing the temperature. - correct answer True
The daytime temperature in your greenhouse is 66 and the nighttime temperature is 72.
What is this condition called?
-DIF
Zero DIF
+DIF
Normal DIF - correct answer - DIF
Growing Degree Days (gdds) or heat units are useful for....?
Timing pest managemnt
Predicting harvests
Predicting crop stages
All of these - correct answer all of these
Warm temperatures favor the transition from ________ to ________________, while
cool temperatures favor transition of ______ to _________ - correct answer sugar
Starch
Starch
T/F Only daytime temperatures affect plant growth and development. - correct answer
False
Which are characteristics of a sun leaf? - correct answer smaller
Thicker
Lighter green
The wavelengths of the visible spectrum range from _______________ to
_____________________. - correct answer 380 to 770 nm
____________ are often called accessory or helper pigments because they are excited
by light energy and pass that energy to __________ for use in photosynthesis.
______________ often intensify under cool nights and warm, bright days and are often
responsible for red colors in fall leaves. - correct answer carotenoids
Chlorophyll a
Anthocyanins
Growth slows or stops - correct answer 0 C (32 F)
Proteins are denatured or destroyed - correct answer 50 C (122 F)
Generic minimum threshold temperature for WARM season plants - correct answer 10
C (50 F)
Generic minimum threshold temperature for COOL season plants - correct answer 5 C
(40 F)
Which of the following is the most correct statement about temperature and the rate of
chemical processes?
-As temperature increases, the rate of chemical processes increases exponentially.
-As temperature increases, the rate of chemical reactions decreases.
-As temperature increases, the rate of chemical reactions increases until a maximum
temperature where the relationship breaks down.
-As temperature increases, the rate of chemical reactions remains the same. - correct
answer As temperature increases, the rate of chemical reactions increases until a
maximum temperature where the relationship breaks down.
You are growing peas. Given the following information, how many gdds have
accumulated?
Minimum baseline temperature: 40 F
Maximum threshold temperature: 80 F
Day 1:
Minimum Temperature: 47
Maximum Temperature: 81
, Day 2:
Minimum Temperature: 52
Maximum Temperature: 82
Day 3:
Minimum Temperature: 41
Maximum Temperature: 75
Day 4:
Minimum Temperature: 37
Maximum Temperature: 87 - correct answer 87.5
The best red fall colors occur when days are ________ AND nights are _______
because __________ rates exceed _____________ rates and the excess sugars
increase the production of ___________ - correct answer bright and warm
Cool
Photosynthesis
Respiration
Anthocyanins
The most energy-efficient greenhouse design ______________. - correct answer
minimizes the surface area to volume ratio
T/F Extreme temperatures in either direction can inhibit root growth. - correct answer
True
Good location for temperature sensor - correct answer close to the plants
T/F In greenhouses, growth of crops can be speeded up or slowed down, to a certain
extent, by increasing or decreasing the temperature. - correct answer True
The daytime temperature in your greenhouse is 66 and the nighttime temperature is 72.
What is this condition called?
-DIF
Zero DIF
+DIF
Normal DIF - correct answer - DIF
Growing Degree Days (gdds) or heat units are useful for....?
Timing pest managemnt
Predicting harvests
Predicting crop stages
All of these - correct answer all of these
Warm temperatures favor the transition from ________ to ________________, while
cool temperatures favor transition of ______ to _________ - correct answer sugar
Starch
Starch
