Answer Posted / anitha
Pitcher plants are carnivorous plants whose prey-trapping
mechanism features a deep cavity filled with liquid known
as a pitfall trap. It has been widely assumed that the
various sorts of pitfall trap evolved from rolled leaves,
with selection pressure favouring more deeply cupped leaves
over evolutionary time. However, some pitcher plant genera
(such as Nepenthes) are placed within clades consisting
mostly of flypaper traps: this indicates that this view may
be too simplistic, and some pitchers may have evolved from
flypaper traps by loss of mucilage.
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