Plant Body Page 2
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II. Seeds
A. Top Three major
human foods are grass seeds/fruit (Grains)
B. Development
of Agriculture instrumental to civilization
1.
Wheat
-
Near East, 9,000 years ago
-
550,993,000 Metric Tons
2.
Rice
-
Eastern China & Northern
India, 7,000 years ago
-
478,775,000 Metric Tons
-
3.
Corn
-
Central Mexico, 5,500 years
ago
-
261,162,000 Metric Tons
-
C. Comparison of Monocot
and Dicot seeds
D. Seed Germination
1.
Many seeds require exposure to cold before they germinate
2.
Imbibition = uptake of water begins germination process
3.
Tropism = growth response to environmental stimuli
a. Shoots exhibit negative gravitropism
b. Roots exhibit positive gravitropism
c. Shoots exhibit positive phototropism
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