Question

Fill in the blank with a suitable term:
___ are negatively phototropic.

Answer 1

Phototropism:

1. Plants show movements in response to external stimuli. Such movements are termed tropic movements. These movements can be towards the direction of stimuli (positive tropism) or away from the direction of stimuli (negative tropism).
2. Movement in response to light is called phototropism.
3. The roots of plants show growth in the direction opposite to that of light. This is called negative phototropism.

Therefore,

Roots are negatively phototropic.