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13 Cards in this Set
- Front
- Back
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Soil Characteristics:
Texture |
Relative amounts of different sized particles
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Soil Characteristics:
Composition |
Organic and inorganic components
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Conservation Issues:
Irrigation |
drawing down aquifers
salination: water pulls salts from deep below until plants can't grow |
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Conservation Issues:
Erosion |
loss of topsoil
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Conservation Issues:
Soil Reclamation |
removal of heavy metals after mining by phytoremediation (treatment of environmental problems through the use of plants)
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Bacteria and Nitrogen Conversion:
Nitrogen fixing bacteria |
convert N2 in atmosphere to NH3 (ammonia) which is converted to NH4+ in soil by H+ ions
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Bacteria and Nitrogen Conversion:
Nitrifying bacteria |
Convert NH4+ ions to NO3- (most available to plants)
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Bacteria and Nitrogen Conversion:
Denitrifying bacteria |
Converts NO3- to N2 in atmosphere
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Symbiotic Nitrogen Fixation
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occurs in root nodules (mainly legumes) by rhizobium bacteria (called bacteroids)
Must be low O2 environment- use leghemoglobin to capture O2 Ectomycorrhizae- grows outside Endomycorrhizae- grows inside |
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Plant Reproduction:
Sexual |
Outcrossing: male and female from diff. plants
Self-fertilization: male and female from same plant |
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Plant Reproduction:
Asexual |
Fragmentation: Separation into parts
Apomixis: cloned seeds |
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Sexual Reproduction:
Advantages |
Variation: good for variable environments
Dispersal: through fruits |
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Sexual Reproduction:
Disadvantages |
Risky: doesn't guarantee success; might not get pollenated
Seedling establishment is tricky: dispersal and starting growth |
