Conclusion
The sex of the flowers of plantain depends upon the amount of nourishment available. When there is plenty of nourishment, female flowers and fruits are formed. When the plants are exhausted and only a small amount of nourishment is available for the growing flowers, the latter differentiate as male flowers.
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References
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Joshi, A.C. A note on the determination of sex of plantain flowers. Journ. of Genetics 38, 353–356 (1939). https://doi.org/10.1007/BF02982180
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DOI: https://doi.org/10.1007/BF02982180