BotanyPreharvest fruit drop can be checked by a PGR, variant of which

Preharvest fruit drop can be checked by a PGR, variant of which

  1. A
    was synthesised by autoclaving DNA
  2. B
    was used as defoliant in Vietnam war
  3. C
    caused bakane disease
  4. D
    effects petiole elongation in submerged rice seedling

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    Solution:

    Preharvest fruit drop is prevented by spraying auxins which prevent abscission of underdeveloped fruits and promotes the drop of ripened fruits. Two of the synthetic auxins known as 2,4 - Dichlorophenoxy acetic acid and 2,4,5 - Trichlorophenoxy acetic acid were used as agent orange of Vietnam war by Americans as defoliants containing dioxin.

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