Question

Tropic movements occur as a result of:

• A. Unidirectional effect of environmental factors on plant organs
• B. Bidirectional effect of environmental factors on plant organs
• C. Multidirectional effect of environmental factors on plant organs
• D. No effect of environmental factors on plant organs

Answer 1

The correct option is A Unidirectional effect of environmental factors on plant organs

Tropic movement is growth movement shown by plants in response to a unidirectional external stimulus. It is specific for direction and depends on the direction of stimulus. Movement towards the direction of stimulus is called positive tropism while movement away from stimulus is called negative tropism. It results in positioning of the plant parts in the direction of the stimulus.

Thus, the correct answer is option A.