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Biology

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1.frequency of plant growth?
2.frequncy of crop yield?

whats that mean!! help

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Frequency of plant growth:

Plant emit audio acoustic emissions between 10 - 240 Hz as well as ultrasonic acoustic emissions (UAE) within 20 - 300 kHz. Evidence for plant mechanosensory abilities are shown when roots are subjected to unidirectional 220 Hz sound and subsequently grow in the direction of the vibration source.

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