phototropic

[ foh-tuh-trop-ik, -troh-pik ]

/ ˌfoʊ təˈtrɒp ɪk, -ˈtroʊ pɪk /

growing toward or away from the light.

taking a particular direction under the influence of light.

Origin of phototropic

First recorded in 1895–1900; photo- + -tropic

pho·to·trop·i·cal·ly, adverb

For the past decade, he has used the phototropic properties of cyanobacteria to produce images in Petri dishes.

The Deadliest Art Ever |Jaimie Etkin |May 31, 2010 |DAILY BEAST
The record (Fig. 127) shows that the phototropic effect increases with the directive angle.

Life Movements in Plants, Volume II, 1919 |Sir Jagadis Chunder Bose
Thus no phototropic response is found in the tendril of Passiflora even under the action of strong light.

Life Movements in Plants, Volume II, 1919 |Sir Jagadis Chunder Bose
I shall now describe the phototropic effect of unilateral light in pulvinated, and in growing organs.

Life Movements in Plants, Volume II, 1919 |Sir Jagadis Chunder Bose

But the same leaflets acted on by light from below exhibit a folding upwards, the phototropic effect being now negative.

Life Movements in Plants, Volume II, 1919 |Sir Jagadis Chunder Bose
We shall find in the next chapter that the intensity of phototropic effect is proportional to the quantity of incident light.

Life Movements in Plants, Volume II, 1919 |Sir Jagadis Chunder Bose