Selaginella sperms swim towards archegonia. The phenomenon is

Chemotaxis

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Chemotropism

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Chemonasty

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Thigmonasty

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Solution

The correct option is D Chemotaxis
Chemotaxis is the movement shown by organism in the direction of the external chemical stimuli. In Selaginella, sperm sense the chemoattractant and orient its swimming towards the archegnonia. Chemotropism is the growth movement shown by organism in the direction of the external chemical stimuli. Chemonasty is the nastic movement shown by organism in response to the external chemical stimuli. Spermatozoa can sense this chemoattractant and orient their swimming direction up the concentration gradient towards the egg cell located in the venter of archegonia
So, the correct answer is 'Chemotaxis'

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