Answers

2016-03-20T07:47:40+05:30
Because it form by sexual reproductions
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2016-03-20T17:12:43+05:30
Because it is formed by meiosis in microspore mother cell. It is haploid and that allows it to fertilise with another haploid megaspore and give rise to a diploid zygote which will germinate into a mature plant body . (In some cases if the plant follows haplontic cycle the temporary gametophyte can again perform meiosis and continue being haploid like in bryophytes. ) . In angiosperms the haploid spores give rise to diploid zygote ( thus maintains a constant ploidy ) and matures into a plant body.
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