The presence of ciliated antherozoids in Dryo | vedclass

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(B) $Dryopteris$ is a member of the Pteridophyta group. In Pteridophytes,the male gametes (antherozoids) are flagellated or ciliated,which allows them

Vedclass · Accepted Answer

Aquatic ancestry

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(B) $Dryopteris$ is a member of the Pteridophyta group. In Pteridophytes,the male gametes (antherozoids) are flagellated or ciliated,which allows them to swim in a film of water to reach the female gamete (egg) inside the archegonium. This requirement for water for fertilization is a primitive trait inherited from aquatic ancestors,even though $Dryopteris$ is a terrestrial plant. Therefore,the presence of ciliated antherozoids is a clear indication of their aquatic ancestry.

The presence of ciliated antherozoids in $Dryopteris$ indicates:

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