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Fern sperm are ________, which is why ferns are dependent on water for reproduction. fern sperm are ________, which is why ferns are dependent on water for reproduction. ciliated amoeboid flagellated

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Fern sperms are flagellated, which is why ferns are dependent on water for reproduction. Water serves as a medium in which sperms can reach the egg cell for fertilization. The sperm only needs a thin film of water to swim from the antheridium and to the archegonium. 
The answer for the above question is flagellated.
Most fern produce through the alternation of generations, alternating successive generations of sexual and asexual forms. The sexual form is called the gametophyte. The gametophyte produces gametes by mitosis. A mobile, flagellate sperm fertilizes and egg that remains attached to the prothallus. 

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