Plant KingdomHard
Question
in which one of the following, male and female gametophytes don’t have free living independentrxistence ?
Options
A.Pteris
B.Funaria
C.Polytrichum
D.Cedrus
Solution
In Pteris (also Dryopteris) the spore germinates to produce the prothallus. The prothallus is a small, Green flat, surface loving, thallus-like object It is monoecious and bears sex organs on the ventral side. The antheridia (male sex organs) arise among the rhizoids twoards the posterior side of the prothallus and are emergent. The archegonia develop in central cushio behind the apicsl notch . in theseplants male and female, gametophytes do not have free living independent existence. All species of Polytrichum are diecions. The antheridia and archegonia are borne on Different gametophore. The plant body is an erect leafy shoot but is not the entire gametophyte. The leafy shoot arise from protonema (the juvenile stage)
The leafy gametophore of Funaria reproduces sexually by formation of antheridia and archego nia. The antheridia are formed at the summit of a relatively small, thin, leafy shoot, which devel ops first. The female beanch arises later as a lateral outgrowth from the base of parent male hoot.
The leafy gametophore of Funaria reproduces sexually by formation of antheridia and archego nia. The antheridia are formed at the summit of a relatively small, thin, leafy shoot, which devel ops first. The female beanch arises later as a lateral outgrowth from the base of parent male hoot.
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