Question: what is significance of tropic movement in plants
[{'answer': 'response to an environmental stimulus', 'provenance': [{'wikipedia_id': '576334', 'title': 'Tropism', 'start_paragraph_id': 1, 'start_character': 165, 'end_paragraph_id': 1, 'end_character': 202, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '576334', 'title': 'Tropism', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 853, 'bleu_score': 0.94562645577806, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9210713935816636013}, 'section': 'Section::::Abstract.'}]}]