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Plant Form and Function Plant Responses to Internal and External Signals. Plant biology, perhaps the oldest branch of science, is driven by a combination of curiosity and need curiosity about how plants work

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plant form and function plant responses to internal and external signals
Plant Form and FunctionPlant Responses to Internal and External Signals

Plant biology, perhaps the oldest branch of science, is driven by a combination of curiosity and need

curiosityabout how plants work

needto apply this knowledge judiciously to feed, clothe, and house a burgeoning human population.

tropisms
Tropisms
  • Growth toward or away from a stimulus
    • Gravitropism (Gravity)
    • Phototropism (Light)
    • Thigmotropism (Touch)
etiolation
Etiolation
  • The stems of plants raised in the dark elongate much more rapidly than normal, a phenomenon called etiolation.
signal transduction pathway

CYTOPLASM

CELL

WALL

3 Response

  1 Reception

2 Transduction

Activation

of cellular

responses

Relay molecules

Receptor

Hormone or

environmental

stimulus

Plasma membrane

Signal Transduction Pathway
hormones
Hormones
  • Are chemical signals that coordinate the different parts of an organism
  • Help coordinate growth, development,and responses to stimuli
photoperiod
Photoperiod
  • The relative lengths of night and day
  • The environmental stimulus plants use most often to detect the time of year