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Sperms of both Funaria and Pteris were released together near the archegonia of Pteris. Only its sperms enter the archegonia as

1. Pteris archegonia repel Funaria sperms
2. Funaria sperms get killed by Pteris sperms
3. Funaria sperms are less mobile
4. Pteris archegonia release chemical to attract its sperms

Correct answer: Pteris archegonia release chemical to attract its sperms

Solution

Pteris archegonia secrete chemical attractants that specifically guide Pteris sperms toward them. This chemotactic signal explains why, even when mixed with Funaria sperms, only Pteris sperms enter the archegonia.

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