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