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A moss plant produces a large number of ...

A moss plant produces a large number of antherozoids but relatively only a few egg cells. Why ?

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Antherozoids are motile male gametophytes which have to swim on the water surface to fertilize the immotile female gametophytes, i.e., egg.
Since, during its transfer many antherozoids get destroyed, a large number of them are produced.
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