Chapter 8 Review
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Geography
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Dec 6, 2023
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1.) Temperature determines seed germination.
True
2.) Growing degree days is the same as the average daily temperature.
False
3.) Vernalization is the same as scarification.
False
4.) Growing temperatures across the United States are similar.
False
5.) Zone 1 of the USDA hardiness zones never experiences frost.
False
Short Answer
6.) List five cool-season and five warm-season crops.
Cool-Season: Wheat, Fescue, Turnips, Oats, and Cabbage.
Warm-Season: Cotton, Bermuda grass, Peppers, Corn, and Beans.
7.) If the low temperature for the day was 45F and the high was 80E, and the base is 44F,
calculate the growing degree days.
Mean temperature: 62.5. Above Tbase, so 62.5 - 44 = 18.5
8.) List the hardiness zones in the United States.
The hardiness zones in the United States include Zone 1 below -45C, Zone 2-45C to -40C,
Zone 3 -40C to -34C, Zone 4-34C to -29C, Zone 5 -29C to -23C, Zone 6-23C to - 18C, Zone.
7-18C to -12C, Zone 8 - 12C to -7C, Zone 9-7C to - 1C, Zone 10 - 1C to +4C, and Zone 11
above +4C.
9.) What is the optimal germination temperature for each of the following: eggplant, lettuce,
cabbage, tomato, and onions?
Eggplant: 85F. Lettuce: 75F. Cabbage: 85F. Tomato: 85F. Onion: 75F.
10.)
_ effects many essential plant growth processes.
Temperature of the weather.
11. Compare the growing degree days in Florida to those in Montana, New York, and Oregon.
The growing degree days in Florida are much higher than those in
Montana, New York, and Oregon.
12.Explain the concept of hardiness zones
A hardiness zone
is a geographic area defined as having a certain average annual
minimum temperature, a factor relevant to the survival of many plants.
13. What is a thermoperiod? Give an example.
Thermoperiod refers to daily temperature change. Plants grow best when
daytime temperature is about 10 to 15 degrees higher than nighttime
temperature. The most flowers are produced when tomatoes are grown at
26.7° C (80° F) during the day and 17.2°–20° C (63°–68° F) at night.
14. Discuss the damages that can be caused by varying severities of frost.
Cold temperature damage causes buds, flowers, and shoots to curl, turn brown or black,
and die. Foliage appears scorched because low temperatures severely dehydrate plant
tissue. Bark and wood can crack or split, and whole branches or entire plants may be
killed if temperatures are below those tolerated by the plant.
15. Describe vernalization and dormancy.
Dormancy refers to the suspension of the organism's growth in anticipation or response
to environmental change, while vernalization refers to the plants ability to set flowers or
produce fruit after dormancy in a direct response to cold weather exposure.
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