Antherozoids are attracted towards archegonia in a fern plant. The phenomenon is

Nyctinasty

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Chemonasty

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Thigmonasty

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Seismonasty

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Solution

The correct option is B Chemonasty
Nyctinasty is the rhythmic nastic movement shown by plant in response to onset of darkness. Chemonasty is the nastic movement shown by plant in response to external chemical stimuli. Antherozoids are attracted towards archegonia in a fern plant due to chemonastic movement. Thigmonasty is the nastic movement shown by plant in response to the touch. Seismonasty is the nastic movement shown by plant in response to the vibration.
Thus, the correct answer is option B.

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