In unisexual plants, the sex can be changed by
  • a ethanol
  • b auxin
  • c cytokinin
  • d ABA

Dear student,

The correct option (b) auxin. 
Auxin is the plant hormone responsible to the change sex ratio in some unisexual plants. ‚ÄčThe auxin increases the number of female flowers . and decreases the number of male flowers.

Regards

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