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Which one of the following plants is monoecious?
A
Papaya
B
$Marchantia$
C
$Pinus$
D
$Cycas$
Detailed Solution
In a monoecious plant the male and female reproductive structures are borne on the same plant; in a dioecious plant they are on different plants.
In $Pinus$ the male cones and female cones are borne on the same tree, so it is monoecious.
Papaya has separate male and female plants (dioecious).
$Marchantia$ has separate male and female thalli (dioecious), and in $Cycas$ male cones and megasporophylls are borne on different trees (dioecious).
Hence the monoecious plant is $Pinus$.
In $Pinus$ the male cones and female cones are borne on the same tree, so it is monoecious.
Papaya has separate male and female plants (dioecious).
$Marchantia$ has separate male and female thalli (dioecious), and in $Cycas$ male cones and megasporophylls are borne on different trees (dioecious).
Hence the monoecious plant is $Pinus$.