1. *
07/16/96
Plant Growth
26-2
Unlike animals plants continue to grow and increase in size throughout their lives.
Prep Needed: Set up LT Side Three
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2. Guide For Reading What are meristems? What is a tropism?
What do auxins do for plant growth?
What changes must occur as a plant grows?
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3. Meristematic Regions Apical meristems Root meristems Cambiums
vascular cambium
cork cambium
Flowers, leaves grow also from meristematic tissue.
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4. Tropisms Plants grow in response to cues from their environments.
These responses are called tropisms.
(Frame LT Side Three)
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5. Geotropism Reponse to gravity Stems grow away (negative)
Roots grow toward (positive) - (Chapter 18 - LT Side Three)
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6. Phototropism Response to light Stems are positively phototropic
Roots are negatively phototropic
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7. Thigmotropism Response to touch Sensitive plant Briar leguminosae
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8. Plant Hormones
Auxins
Cytokinins
Gibbeillins
Ethylene
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9. Auxins Produced by the apical meristem Apical dominance
Auxin produces phototropism
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10. Auxins
Apical dominance
Stronger
Weaker
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11. Cytokinins
Like auxins cytokinins effect the rates of plant growth and cell division.
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12. Gibberillins Gibberillins regulate the rate which cells elongate.
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13. Ethylene Ethylene promotes fruit ripening
(Frame LT Side Three)
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