Selaginella sperms swims towards the archegonia, this movement is

Seismonasty

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Chemotactic

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Phototactic

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Archaenastic

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Solution

The correct option is B Chemotactic
In bryophytes and pteridophytes (e.g., Selaginella), the swimming antherozoids are attracted towards the archegonium by chemical stimuli such as organic substances like sugar, malic acid and so on. This is called as chemotactic movement.
Thus, the correct answer is option B.

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

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