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QUADRANT METHOD OF RESPONSE
multiple. The following table shows the parallel effects exhibited by diverse modes of response.
Table showing parallelism in different modes of response
| External change | Mechanical response | Variation of growth | Electro-motive response | Resistivity variation |
| Sub-minimal stimulus | Expansion; erectile response | Acceleration of growth | Galvanometric positivity | Increase of resistance |
| Moderate stimulus | Contraction and fall of leaf | Retardation of growth | Galvanometric negativity | Diminution of resistance |
| Strong stimulus | Multiple response | Multiple response | Multiple response | Multiple response |
| Depressants | Diminished response | Retardation of growth | Diminished response | Diminished response |
| Stimulating agents | Enhanced response | Acceleration of growth | Enhanced response | Enhanced response |
(Life Movements in Plants, Vol. IV, 1923.)
