Horticulture Unit 2 exam
The importance of day, night, and soil temperature - Answer-Day Temps and Night temps affect plant
growth
most plants grow at night
lowering night temps conserves food growth
most plants grow best when night temps are cooler then day temps.
Plant height can be controlled by manipulating the DIFference between day and night temps
Soil temperature affects the seed germination, root growth, plant growth and development, water
uptake, and disease susceptibility.
sun leaves vs shade leaves - Answer-shade leaves are larger, darker green, and thinner
sun leaves are smaller, lighter green, and thicker.
visible light spectrum - Answer-the portion of the electromagnetic spectrum that is visible to the human
eye
380-770 nm
Light quality (wavelength) - Answer-380(purple)-770(red)
shorter the wavelength the higher the energy
Light quantity/intensity - Answer-How bright the light is
light duration/photoperiod - Answer-How long is the day vs. how long is the night.
Affects both photosynthesis (food production) and plant development (trigger)
, Shorter days are going to mean slower growth because of less days
blue vs. red light - Answer-blue= short red= long
Pigments - Answer-light absorbing molecules
How light affects plant growth/ morphology - Answer-Light makes the pigments excited and makes
enough energy to store during the dark times as well.
light provides energy for photosynthesis
light determines plant morphology
GDDs (heat units) - Answer-Growing degree days help to predict how long it will take the crop to grow.
formula= (daily min temp + daily max temp)/2 - min threshold temp
Important temperatures to plant growth - Answer-0 C (32 F)growth stops
50 C (122 F)proteins are denatured or destroyed
10 C (50 F) generic minimum threshold temp for WARM season plants
5 C (40 F) generic minimum threshold temp for COOL season plants
The threshold temps are very important for growing. when you are figuring out the GDDs they are very
important.
Green house energy, heating and cooling - Answer-There are lots of ways to do green house energy and
cooling. You can use fans and heaters. On hot days you could have a way to open up your green house
to let the breeze blow through.
DIF - Answer-Day temp-night temp
The importance of day, night, and soil temperature - Answer-Day Temps and Night temps affect plant
growth
most plants grow at night
lowering night temps conserves food growth
most plants grow best when night temps are cooler then day temps.
Plant height can be controlled by manipulating the DIFference between day and night temps
Soil temperature affects the seed germination, root growth, plant growth and development, water
uptake, and disease susceptibility.
sun leaves vs shade leaves - Answer-shade leaves are larger, darker green, and thinner
sun leaves are smaller, lighter green, and thicker.
visible light spectrum - Answer-the portion of the electromagnetic spectrum that is visible to the human
eye
380-770 nm
Light quality (wavelength) - Answer-380(purple)-770(red)
shorter the wavelength the higher the energy
Light quantity/intensity - Answer-How bright the light is
light duration/photoperiod - Answer-How long is the day vs. how long is the night.
Affects both photosynthesis (food production) and plant development (trigger)
, Shorter days are going to mean slower growth because of less days
blue vs. red light - Answer-blue= short red= long
Pigments - Answer-light absorbing molecules
How light affects plant growth/ morphology - Answer-Light makes the pigments excited and makes
enough energy to store during the dark times as well.
light provides energy for photosynthesis
light determines plant morphology
GDDs (heat units) - Answer-Growing degree days help to predict how long it will take the crop to grow.
formula= (daily min temp + daily max temp)/2 - min threshold temp
Important temperatures to plant growth - Answer-0 C (32 F)growth stops
50 C (122 F)proteins are denatured or destroyed
10 C (50 F) generic minimum threshold temp for WARM season plants
5 C (40 F) generic minimum threshold temp for COOL season plants
The threshold temps are very important for growing. when you are figuring out the GDDs they are very
important.
Green house energy, heating and cooling - Answer-There are lots of ways to do green house energy and
cooling. You can use fans and heaters. On hot days you could have a way to open up your green house
to let the breeze blow through.
DIF - Answer-Day temp-night temp
