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PSS Phenology Exam 2 Part 9 Questions & Answers 2024/2025
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PSS Phenology Exam 2 Part 9 Questions & Answers 2024/2025
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PSS Phenology Exam 2 Part 9 Questions& Answers 2024/2025
Rest - ANSWERS=internal conditions that prevent growth. Most temperate landscape plants need a
minimum of 6 - 8 weeks of cold
Dormancy - ANSWERS=external (cold) conditions that prevent growth. Warm weather needed for growth
to begin
Temperature affects - ANSWERSphotosynthesis, respiration, transpiration, seed germination, pollination,
enzyme activity
Temperature is the #1 factor which affects where plants can grow in a given area/region - ANSWERS-Cool
season crops (lettuce, radish, peas, cabbage...). Will tolerate a frost due to increased solutes (sugars,
etc.) in the cells and also cell membranes that are less "leaky" in cold temperatures
-Warm season crops (corn, beans, tomatoes, etc.). Will not tolerate a frost. Cell membranes easily leak
cell contents.
Heat units = GDU's - ANSWERSBase temp = 40° or 50°F depending on the crop type
Uses: - ANSWERS-Predict harvest time
-Predict bloom date
-Predict certain pest problems
-Determine if a certain crop will grow and mature in your area
Phenology - ANSWERSrelating development of one plant to another. Lilacs and tomatoes
Cold hardiness = ability to withstand freezing. - ANSWERSice inside the cells is bad
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