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Because fern spores germinate to produce gametophytes on which male and female reproductive organs are produced for sexual reproduction. Likewise in flowering plants large number of pollen grains are produced to ensure gametic union. Once the fertilization is achieved the sporophytic generation begins and there is surity of survival in diploid phase. Hence gametes are produced in plenty and zygotes and seeds in limited ammount.

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Jaunita Hand

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Q: Why do ferns and mosses reproduce using spores?
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