Figure 1 The rhododendron thermometer.
A tropism (from the Greek trope — a turning) is growth or turning in response to an environmental stimulus.
The ‘rhododendron thermometer’ (Figure 1) shows the response of chilled leaves of rhododendrons to increased temperature. This thermotropism — curling and drooping of the leaves when cold — reduces water loss, and also reduces bleaching of chlorophyll in bright sunlight.
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