Discussion
The treatment of abscisic acid is associated with .....................
Answer: C
Abscisic acid treatment is associated with closure of stomata.
Under water stress, ABA builds up in leaves and acts on guard cells: it triggers the efflux of K+ and anions, the guard cells lose turgor, and the stomata close, cutting water loss. This is why ABA is called the stress hormone.
ABA generally inhibits growth, so internode elongation (a gibberellin effect), leaf expansion (printed 'lead area') and root elongation are not effects it promotes.
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