Experiment to demonstrate positive phototropism in
shoot tips
A
darkened black box is taken having a small window on one side. A wellwatered
potted plant is placed inside the box. This is referred to as a phototropic
chamber or heliotropic chamber. If the window is kept closed for about 24 hours
the plant shows normal growth. If the window is kept opened, it is found after
two days that the shoot tip bends and grows towards light proving that it is
positively phototropic (Figure 15.20).
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