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Plant Growth: Internal & External Factors
19
20
Biology
Undergraduate 2
11/07/2012

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Cards

Term
Hormones
Definition
internal chemicals that regulate and coordinate
Term
Original Hormone Concept -3
Definition
Synthesis, transport, induced chemical response
Term
6 classes of hormones
Definition
Auxins - Cytokinins - Ethylene - Abscisic Acid - Gibberellins - Brassinosteroids
Term
Auxins
Definition
increase rate of cell division, increase rate of cell expansion, longitudinal direction of cell expansion and have differentiation
Term
Cytokinins
Definition
increase rate of cell division, don't affect cell expansion, differntiation
Term
Ethylene
Definition
Increase or decrease in rate of cell division, increase or decrease rate of cell expansion, later expansion, differentiation
Term
Abscisic acid
Definition
negative cell division, negative cell expansion, differentiation
Term
gibberellins
Definition
increase in cell division and expansion, longitudinal expansion, differentiation
Term
Brassinosteroids
Definition
cell division and elongation, differentiation,
Term
Tropism
Definition
response to external
Term
Phototropism
Definition
response to light - auxin
Term
Gravitropism
Definition
response to gravity - auxin, hydrostatic pressure
Term
Hydrotropism
Definition
water
Term
thigmotropism
Definition
tough
Term
heliotropism
Definition
maximizes or minimizes exposure to solar radiation
Term
Endogenous-
Definition
internal clock
Term
Photoperiodism
Definition
flower only under certain day length conditions
Term
vernalization
Definition
exposure to periods of cold can control flowering
Term
dormancy
Definition
arrested growth during unfavorable conditions
Term
nastic movements and thigmomorphogeneis
Definition
sleep movements, shorter and tough when touched, tall and weak when not
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