By sound of wind and fire and thunder, their fruits and flowers fall down. Sound is perceived through the ear. Trees have, therefore, ears and do hear.
वाय्वग्न्यशनिनिर्घोषैः फलं पुष्पं विशीर्यते। श्रोत्रेण गृह्यते शब्दस्तस्माच्छृण्वन्ति पादपाः॥