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Hort Exam 2
Terms in this set (50)
Which of the following is the naturally occurring auxin in plants?
Benzyladenine is a synthetic_______
where is the site of gibberellic acid production in the plant?
all are sites of production
________ is the response to touch
At the cellular level, which hormone is important in triggering cell division?
who was the first to postulate that plants contained horomones?
_______ can be sprayed on peach trees in the spring to cause fruit or flowering thinning.
________ can be used in tissue culture to stimulate adventitious shoot formation.
_______ can be sprayed on greenhouse azaleas to overcome and substitute for cold treatment needed by their buds.
________ is the curling and contortion of leaves, and is caused by ______.
______ favors staminate flower formation on monoecious plants, such as cucumbers.
one should never store cut flowers and fruit together in the same cooler or refrigerator.
_________ protects plants from drought stress by causing the stomata to close when it starts to get dry.
_______ can be used to trigger a bromeliad, such as pineapple, to flower.
_______ is the amount of heat needed to raise 1 g of a substance by 1 oC.
greenhouses are cooled by fan and pad cooling systems. This relies on the very high _____ of water which is _____.
heat of vaporization/ 540
the greenhouse effect is caused by trapping _______ within the atmosphere.
when water freezes, heat energy is _____ the surroundings.
what is the name of 23 1/2o north latitude, which occurs as the upper limit of the tropical climatic zone?
Tropic of Cancer
at the summer solstice, the earth's axis (at the North Pole) is ______ relative to the sun's axis.
tilted 23 1/2 degrees towards the sun.
on average, the warmest to coldest sides of a building during the winters are______.
south, west, east, north
at the vernal equinox, the sun's rays strike the earth at 90 degree angle at the _______.
the optimum temperature for cool season crops is ______.
which is not a method used to control high temperatures in greenhouses in Texas?
all are used in greenhouses
______ is loss of heat by long wavelength infrared radiation.
if the low temperature at night is predicted to be 23 and the dew point is 37 oF, which of the following would you predict?
during a radiational freeze, a warm layer of air occurs about 10-15 feet above a cold layer of air that is next to the ground, this is called a ______.
_______ is a type of freeze damage where the cambium under the bark freezes and expands.
which of the following prevents radiational freeze by decreasing radiational cooling?
create cloud of fog of water vapor
what is the first thing that triggers hardening off or cold acclimation of woody plants for the winter?
which type of dormancy is caused by a low level of growth promoters and or a high level of growth inhibitors in plants?
orient pear is a 650 hour variety. If you planted orient pear in Deaf Smith county in the panhandle of north Texas, which is a 1200 hour zone, it would?
flower too early in the spring
which has the longer chilling requirement?
what is the name of the treatment or technique used on seeds of temperate trees to overcome their chilling requirement and cause them to germinate?
_______ is flower formation and seed stalk elongation in biennials.
what is the wavelength range of visible light?
which type of instrument measures photosynthetically active radiation?
when plants bend towards light in response to higher light intensity on one side of the plant, this is called______.
if a plant is grown in very low light, it will be long and spindly with pale green to yellowish leaves. This is called _______
at a light intensity above a plant's light compensation point, the rate of photosynthesis will be ______ the rate of respiration.
at low light intensities, which type of plant will have the higher rate of photosynthesis?
shade or acclimatized plant
one method of acclimatization is to give the plant a final period of greatly reduced light intensity before placing it indoors. How long should the plants be left in the acclimatization treatment?
if you wanted to shift all the phytochrome in a plant into the active form, you should shine _____ red light on the plant.
In the concept of the atmospheric window, which type of light is not selectively affected upon passing through the earth's atmosphere?
a _____ is a plant that is not affected by photoperiod.
which of the following is not a type of response that some plants have to photoperiod?
all responses are valid
today sunrise was at 7:30 am and will set at 6:51 pm. Therefore, what is the photoperiod that plants will perceive today?
12 hours 21 minutes
what part of the plant measures photoperiod, and is the site of perception of photoperiod?
for photoperiodic plants, when do all the critical events occur that trigger flowering?
during the night
chrysanthemums are short day plants. If you wanted to make one flower during the summer, you should ______.
cover with black cloth about 5pm for the last part of the day and throughout the night.
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