This is the 3483rd most frequent Portuguese word.
observada
"Observed."
Here, 'observada' is used in the context of passive voice, referring to the action of observing performed by a specific subject, being the astronomers.
A lua foi observada por um grupo de astrônomos esta noite.
The moon was observed by a group of astronomers tonight.
In this context, 'observada' also appears in the passive voice, emphasizing the perception or noting of the behavioral change by the team.
A mudança de comportamento foi claramente observada pela equipe.
The change in behavior was clearly observed by the team.
In this usage, 'observada' is part of a descriptive clause, indicating the context in which the plant revealed details.