When the sperms of $Funaria$ and $Pteris$ are put together near the archegonia of $Pteris$,only the sperms of $Pteris$ readily enter the archegonia and reach the egg. The reason being that
- ASperms of $Funaria$ are killed when mixed with sperms of $Pteris$
- BArchegonia of $Pteris$ secrete a substance which repels sperms of $Funaria$
- CArchegonia of $Pteris$ secrete a chemical substance which attracts sperms of $Pteris$ chemotactically
- DSperms of $Funaria$ are less motile
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