In bryophytes male gamete reach archegonia by 
1 . thigmotaxis 
2 . chemotaxis 
3 . thermotaxis 
4 . anemophily 

Dear Student,
In flowering plants the flowers are essential in the sexual reproductive cycle, with the pollen (the male gametes) from one flower typically being carried to another by some agency, most commonly wind or insects. Once the pollen has been deposited it will fertilize the eggs in the receiving plant. Bryophytes have neither pollen nor flowers and rely on water to carry the male gametes (the sperm) to the female gametes (the eggs). The spore capsules are produced after the sperm have fertilized the eggs. Hence the spores are part of the sexual reproductive cycle. So here correct option is D- anemophily i.e by WIND. 

Regards.

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